Here is the full list of all 85 Slime-san achievements.
Talk to five citizens in Slumptown.
Buy one piece of clothing.
Buy one piece of sideart.
Beat all levels in World 1.
Collect all the Apples in World 1.
Beat all the Trophy times in World 1.
Beat all New Game PLUS levels in World 1.
Beat all normal and NG+ levels, collect all the Apples and beat all the Trophy times in World 1.
Beat all levels in World 2.
Collect all the Apples in World 2.
Beat all the Trophy times in World 2.
Beat all New Game PLUS levels in World 2.
Beat all normal and NG+ levels, collect all the Apples and beat all the Trophy times in World 2.
Beat all levels in World 3.
Collect all the Apples in World 3.
Beat all the Trophy times in World 3.
Beat all New Game PLUS levels in World 3.
Beat all normal and NG+ levels, collect all the Apples and beat all the Trophy times in World 3.
Beat all levels in World 4.
Collect all the Apples in World 4.
Beat all the Trophy times in World 4.
Beat all New Game PLUS levels in World 4.
Beat all normal and NG+ levels, collect all the Apples and beat all the Trophy times in World 4.
Beat all levels in World 5.
Collect all the Apples in World 5.
Beat all the Trophy times in World 5.
Beat all New Game PLUS levels in World 5.
Beat all normal and NG+ levels, collect all the Apples and beat all the Trophy times in World 5.
Beat all levels in the game.
Collect all the Apples in the game.
Beat all the Trophy times in the game.
Beat all New Game PLUS levels in the game.
Beat all normal and NG+ levels, collect all the Apples and beat all the Trophy times in the game.
Unlock and beat level 101.
Beat the trophy time of level 101.
Unlock and beat New Game PLUS level 101.
Beat a Speed Running Mode!
Beat a Boss Rush Mode!
Buy one Playstyle.
Buy all Playstyles.
Buy all pieces of clothing.
Buy one shader.
Buy all shaders.
Buy all pieces of sideart.
Beat one target mode challenge.
Beat all target mode challenges.
Unlock one arcade game!
Unlock all arcade games!
Watch one cutscene in the settings.
Look at one international leaderboard!
Find grandpa-san in Slime town.
Listen to one track on any jukebox.
Beat all the achievements in Slime-san!
Beat levels 1 to 5.
Beat levels 1 to 5 in NG+.
Beat levels 6 to 10.
Beat levels 6 to 10 in NG+.
Beat levels 11 to 15.
Beat levels 11 to 15 in NG+.
Beat levels 16 to 20.
Beat levels 16 to 20 in NG+.
Beat levels 21 to 25.
Beat levels 21 to 25 in NG+.
Beat level 26.
Beat level 26 in NG+.
Beat the scary dojo challenges 1 to 5.
Beat the scary dojo challenges 1 to 10.
Buy 10 items in the carpenter shop.
Buy out the entire carpenter shop.
Speedrun the entire 25 levels once!
Go through the tutorial levels once.
Beat all core sheeple levels.
Beat all core sheeple level trophy times.
Collect all bugs in core sheeple levels.
Beat all core sheeple levels in NG+.
Beat all remix levels.
Beat all remix level trophy times.
Beat the special sheeple level.
Beat the special sheeple level in NG+.
Talk to both hidden indie stars.
Get a high score in all 5 music game tracks.
Purchase half of the gallery.
Purchase all gallery sets.
Complete a speedrun of Sheep's Sequel.
Get the high score in Sheepleman 64.