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