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