Here is the full list of all 30 Will You Snail? achievements.
Admire your beautiful 100% save file in the save slot selection.
Earn a water drop in every level while the pump is broken.
Make it to the end of the game with 0 deaths (without using exploration mode).
Reach level 100 in the smily minigame.
Find the smily minigame.
Start a fresh game and reach the end in less than 30 minutes without using exploration mode.
Find all exploration points.
Find and visit every level.
Collect all difficulty points.
Find the alternative ending of the game.
Find two thirds of all exploration points.
Use the glitch.
Make it to the end game credits.
Beat the boss of the fourth chapter.
Collect three quarters of all difficulty points.
Find one third of all exploration points.
Beat the boss of the third chapter.
Collect half of all difficulty points.
Die 1000 times.
Return for a 2nd play session.
Beat the boss of the second chapter.
Collect one quarter of all difficulty points.
Beat the boss of the first chapter.
Complete the 3rd "real" level.
Die 100 times.
Mess up Squid's presentation slides.
Manually change the difficulty.
Make it to the first challenging level.
Show Squid your new hat.
Start the game.