Here is the full list of all 44 Outpost achievements.
The base game contains 39 achievements, and there is 1 DLC pack containing 5 achievements.
Reach night 2
Reach night 10
Reach night 25
Reach night 50
Earn 10 experience in total
Earn 100 experience in total
Earn 1,000 experience in total
Earn 10,000 experience in total
Open 4 chests
Open 44 chests
Open 444 chests
Catch 3 wisps
Catch 33 wisps
Catch 333 wisps
Have 5 talents
Have 25 talents
Encounter 5 different creatures
Encounter 10 different creatures
Have a stone tool
Have a steel tool
Have a silver tool
Have a golden tool
Have all stone tools
Have all steel tools
Have all silver tools
Have all golden tools
Disable the help messages
Start the night with >0 energy
Have talents for every season
Activate a runestone
Activate 12 runestones
Activate 123 runestones
Activate 1234 runestones
Have 50 talents
Have 100 talents
Have a sapphire tool
Have all sapphire tools
Encounter 20 different creatures
Earn 1,000,000 experience in total
Have 150 talents
Have a void tool
Have all void tools
Earn 10,000,000 experience in total
Earn 100,000,000 experience in total