Here is the full list of all 32 Alt254 achievements.
Walk 2540 steps.
Stay in pursuit for 25.4 seconds.
Collect your first memory.
Die for the first time.
Discover 50% of the map.
Open one door of each type.
Get your first life upgrade.
Get your first energy upgrade.
Collect 50% of the memories.
Unlock all checkpoints.
Exit the temple.
Complete the Memory.
Defeat him.
Travel 25.4 kilometers in the game.
Meet her several times.
Play for 2 hours and 54 minutes.
Obtain 12 life shards.
Obtain 12 energy shards.
Collect all the memories.
Stay in a stream of air for 10 seconds.
Get 5 enemies to chase you.
Crush an enemy.
Defeat 254 enemies.
Die 20 times from lack of air.