Here is the full list of all 31 Avatar: Frontiers of Pandora achievements worth 1,000 gamerscore.
Complete the main campaign.
Defeat a thanator (non-feral)
Unlock three Ancestor Skills.
Touch 20 tarsyu saplings.
Touch 20 bellsprigs.
Collect all windswept kites.
Complete the quest Becoming.
Complete the quest Pushing Back.
Complete the quest Combined Forces.
Complete the quest Revelations.
Complete the quest Rising Pressure.
Collect all windswept dolls.
Complete all recon retrievals.
Unlock 20 Hunter's Guide entries for gatherable wildlife.
Unlock 30 Hunter's Guide entries for gatherable plants.
Collect 30 audio logs.
Unlock an Apex Skill.
Defeat 10 RDA installations.
Defeat five RDA outposts.
Collect 30 notes.
Unlock three recipes for specialty dishes.
Craft a weapon or gear piece of 'superior' rarity or higher.
Collect all treasure hunt comics.
Reach an air quality level of 100%.
Tune all aeolian wind flutes.
Complete all Sarentu totem interactions.
Complete 10 Mycelium Network activities.
Follow all the bladewing moths to their nests
Complete part 3 of the Aranahe Community, Zeswa Community, and Kame'tire Community side quests.
Complete the final Steady Wings side quest
Unlock 3 skills in each skill tree