Here is the full list of all 26 Oxygen achievements.
Complete the basics tutorial
Complete the challenges tutorial
Complete the confidence tutorial
Complete the exploration tutorial
Survive until day 10
Survive until day 20
Reach a population of 25 people
Reach a population of 35 people
Store 300 water
Store 300 food
Store 4000 energy
Survive until day 50
Survive until day 100
Survive until day 200
Reach a population of 50 people
Reach a population of 100 people
Reach a population of 150 people
Store 500 water
Store 1000 water
Store 2000 water
Store 500 food
Store 1000 food
Store 2000 food
Store 8k energy
Store 10k energy
Store 13k energy