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