Here is the full list of all 8 Snail Trek - Chapter 3: Lettuce Be achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Reach the end of the game.
Get the maximum possible score.
Explore all the ways to die.
Get from the storeroom to the maintenance shaft in under 40 seconds of game time.
Find an empty room.
Shoot both snails and all the cave monsters.
Make it seem like you're someone else.
Keep watching past the credits.