Not sure what all of the Achievements (minus the secret ones) that you can earn in Spore Galactic Adventures?  MaxisCactus would like to share a list with you then posted in this thread over at the Sporums:

Not sure why your achievement didn’t show up when you thought it should, or simply looking for some notes on the GA achievement set?

Here’s a quick list of achievements along with some useful notes about earning them. Hope this helps.

  • Secret achievements not listed
  • If you cheat in your game, achievements will not be unlocked

Aeschylus:
Create 10 Adventures. Each must be started from scratch and saved.

Moliere:
Create 50 Adventures. Each must be started from scratch and saved.

Shakespeare:
Create 100 Adventures. Each started from scratch and saved.

Costume Piece:
Create 50 Adventures with Tribe, Civilization and Empire Creatures. Each adventure may have any combination of the three (at least one in each category). Each adventure started from scratch and saved.

Scientist:
Place 200 Non-Accessorized Creatures into your Adventures. You must place 200 un-accessorized creature instances in any number of adventures, each adventure created from scratch and saved.

Going Tribal:
Place 200 Tribal Creatures in your Adventures. You must place 200 tribe-accessorized creature instances in any number of adventures, each adventure created from scratch and saved.

So Civilized:
Place 200 Civilized Creatures in your Adventures. You must place 200 civ-accessorized creature instances in any number of adventures, each adventure created from scratch and saved.

Emperor:
Place 200 Empire Creatures in your Adventures. You must place 200 space-accessorized creature instances in any number of adventures, each adventure created from scratch and saved.

Still Life:
Create 30 Adventures without any creatures. Captain avatar needs to be in the scene and each adventure must be created from scratch and saved.

Happy Times:
Create 30 Adventures with all peaceful actors. This applies to Creatures-only. Each Adventure must be created from scratch and saved.

Large Ensemble:
Create 30 Adventures with over 100 actors in each. Includes creatures/vehicles/buildings. Each Adventure must be created from scratch and saved.

Terraformer:
Create 50 Adventures using planets you terraformed. You must modify the terrain. Each Adventure must be created from scratch and saved. The terrain for each planet must be modified using the terraform stamp tool. Painting or changing the weather does not count, it has to be the terrain that changes. The captain must be in the scene to save.

Architect:
Place 500 Buildings into your Adventures. Adds up over multiple adventures, each Adventure created from scratch and saved. The buildings can be the same instance copied and pasted multiple times in the scene.

Mechanic:
Place 500 Vehicles into your Adventures. Adds up over multiple adventures, each Adventure created from scratch and saved. The buildings can be the same instance copied and pasted multiple times in the scene.

Delirious Designer:
Create 50 Adventures using only your own creations. The creations have to be made from the current user, not others. Creations must be placed in the scene. This includes creatures, vehicles and buildings. Each Adventure created from scratch and saved.

Dabbler:
Download 500 Adventures. This include maxis and user created adventures. This achievement can be also achieved by adding buddies. It will unlock automatically once you log in if they have multiple adventures already uploaded. Adventures must be unique.

Bestseller:
Create a featured Adventure. Note: This is a server side achievement so there will be no pop up. The server takes 8-10 mins. to ping back that the achievement has being completed. This creation must be featured on the web site.

Adventurer:
Complete an Adventure in Space. Any adventures will satisfy this including maxis made. You need to report back to the empire and finish the mission.

Grand Adventurer:
Complete 100 Adventures in the Space Stage. Maxis or user created adventures count and you need to report back to the empires and finish the missions.

Geared Up:
Outfit 50 Creatures with Adventure parts. The creatures have to be different. The creatures need to be saved in the Captain outfitter in order to unlock this achievement.

Consumer:
Finish 200 adventures made by other players. Either SPG or Quick PLay. Captain must be unlocked. Can be unlocked with any adventures (including Maxis-made), as long as they’re not created by the current player. Must be played and completed with a captain not a creature with just adventure parts.

Red Shirt:
Lose 100 posse members while playing Adventures in Space Game. Posse members include creatures befriended in the adventure or SPG posse. This counts with Maxis made or user made adventures. The same adventure can be played over and over to unlock this achievement.

Mercenary:
Kill 1,000 creatures while playing Adventures in Space Game. Epics also count for this achievement. Maxis and player made adventures count. The Adventure must be completed for the kill to count. The same adventure can be played over and over to unlock this achievement.

My Precious:
Collect 3,000 objects while playing Adventures in Space Game. Complete 3,000 collect goals (this is goal based, it does not count for every asset). The goal has to be set to collect. Adventure creators can set the collect goal to buildings, vehicles and creatures. You must finish the adventure to get the achievement. The same adventure can be played over and over to unlock this achievement.

My Hero:
Protect 500 creatures while playing Adventures in Space Game. This achievement actually applies to buildings, vehicles and creatures. Each goal needs to be completed for it to be tallied up at the end of the adventure (this is goal based, it does not count for every asset). The same adventure can be played over and over to unlock this achievement.

Major Contributor:
Give 500 gifts while playing Adventures in Space Game. Note that gifts can be given to vehicles, buildings and creatures. The same adventure can be played over and over to unlock this achievement. This is goal based, it does not count for every asset. The Adventure Must be completed.

Dragon Slayer:
Kill 1,000 Epics while playing Adventures in Space Game. The same adventure can be played over and over to unlock this achievement. The adventure must be successfully completed. This achievement is not goal based, each epic counts.

My First Captain:
Raise a Captain to Rank 10 through Space stage or Quick Play. The creature must be made captain in Space game, but it can be used in Space or Quick Play adventures to earn this achievement.

Captain Academy:
Raise 10 Captains to Rank 10 through Space stage or Quick Play. The creature must be made captain in Space game, but it can be used in Space or Quick Play adventures to earn this achievement.

Storyteller:
Publish 50 adventures. Share 50 adventures, each created from scratch.

Publish Author:
Publish an Adventure. Share an adventure for the first time.

Social Butterfly:
Befriend 1,000 Creatures while playing adventures in the Space Game. The same adventure can be played over and over to unlock this achievement. This is goal based, it does not count for every gift. Adventures must be authored by other players.

Auto Wrecker:
Destroy 1,000 vehicles while playing adventures in the Space Game.

Demolition Expert:
Destroy 1,000 Buildings while playing adventures in the Space Game.

Faithful Zealot:
Unlock all Zealot parts on a captain. Unlock all 4 zealot parts by completing Adventures in Space Game only. Quick play does not count.

Universal Ecologist:
Unlock all Ecologist parts on a captain. Unlock all 4 ecologist parts by completing Adventures in Space Game only. Quick play does not count.

Wise Shaman:
Unlock all shaman parts on a captain. Unlock all 4 shaman parts by completing Adventures in Space Game only. Quick play does not count.

Fierce Warrior:
Unlock all warrior parts on a captain. Unlock all 4 warrior parts by completing Adventures in Space Game only. Quick play does not count.

Industrious Trader:
Unlock all trader parts on a captain. Unlock all 4 trader parts by completing Adventures in Space Game only. Quick play does not count.

Intelligent Scientist:
Unlock all scientist parts on a captain. Unlock all 4 scientist parts by completing Adventures in Space Game only. Quick play does not count.

Joyful Bard:
Unlock all bard parts on a captain. Unlock all 4 bard parts by completing Adventures in Space Game only. Quick play does not count.

Just Diplomat:
Unlock all diplomat parts on a captain. Unlock all 4 diplomat parts by completing Adventures in Space Game only. Quick play does not count.