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