Here is the full list of all 40 Underground Life achievements.
Give money to a beggar
Earn 5000 Rods
Earn 10,000 Rods
Earn 50,000 Rods
Earn 100,000 Rods
Earn 1,000,000 Rods
Kill 20 creatures
Kill 50 creatures
Kill 100 creatures
Kill 1000 creatures
Donate all the treasures to the museum
Finish all Laura's missions.
Finish all Barles missions
Finish all Richard's missions.
Finish all Lenny's missions.
Finish all Frank's missions.
Read all the books
Reach Cooking level 5
Reach Cooking Level 8
Reach the maximum cooking level
Upgrade your shelter totally
Discover the jungle
Discover the lake house
Discover Rocabruma
Discover the Giant Mine bunker
Discover the Dry Border
Discover Sakerfall
Discover the radioactive zone
Dance listening to the radio
Reach maximum mining level
Get put in prison
Kill all bosses
Obtain the fruit of all the seeds
Obtain all kinds of mushrooms
Get drunk for the first time
Get sick from a virus
Wear the anti-radiation suit
Find an alien ship
Travel using a quantum orb
See a ghost in the graveyard