Full list of all 33 Sixty Four achievements.
The base game contains 32 achievements, and there is 1 DLC pack containing 1 achievements.
Get a Hell Gem within the first 64 minutes from the start
Get stuck in the beginning
Play for 64 hours
Finish the game without deleting anything for 5 minutes and having less than 15 Containment Silos
Have 9 Hell Vaults
Explode the Inverse Chasm
Dig down 64 km deep
Have 9 Excavating Channels
Reach a depth of 6400m within 6 minutes of placing a fresh Excavation channel
Get 64 000 000 000 stones
Stare into the abyss 64 times
Teleport 64 times
Get some Void
Get some Reality
Click a cookie
Put two silos together
Honk 64 times for no reason
Get 64 000 000 stones
Get a Hollow Stone
Get some Celestial Foam
Dig down 6400 meters deep
Find a Chromalit
Destroy 64 machines
Click a cube 6400 times
Build 64 machines
Find a Hell gem
Dig down 640 meters deep
Get 64 000 stones
Get Beta-Pylene
Get Qanetite
Dig down 64 meters deep
Get some Elmerine
Complete the game without ever upgrading extraction channels