Here is the full list of all 30 LiEat achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Play Liar (music track) at the Slowest Speed in Post-game
Finish LiEat 1
Eat 15 Cookies
Get Efi to Level 10
Steal the Candy from Keith and Rachel's House
Find Big Liar Equipment
Put Panties on your Head
Defeat a Red Moth
Get Bad Ending from Wolf Encounter
Get Bad Ending from Losing Boss Battle
Steal the Money from the Bookshelf
Fight the "I'm not drunk!" Lie
Find out about Hal's Cracked Phone
Fight the Girlfriend Lie
Fight Three Blue Rats
Rest Two Times in a Row
Poke Efi Three Times While Sleeping
Find the Cherry Candy in the Trash
Bad Ending, Lose to William
Good Ending
Find the Funny Glasses
Have Iris Analyze You
Sleep in the Bed During the Maid Investigation
Find the Legendary Knife and Cookie
Pair up with Iris
Pair up with Neil
Pair up with Brett
Bad Ending
Neutral Ending