| Achievement | How to unlock
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|---|
| "Hard Mode" | Play using an unusual controller
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| Beetle Warrior | KO three slimes in one beetle slime charge attack
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| Button Masher | Play a match with a controller binding that only uses buttons
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| Cat's Meow | Get 777 on the Lucky Neko slots
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| Dive... | Get a simultaneous KO with two kick slimes
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| Dozens of tangled cables | Play a 12+ player local multiplayer game
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| Grandmaster | Win every round in a 32+ round Monobattle
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| Guard House | Have 10 summoned jars out simultaneously
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| How do you have this many USB ports??? | Play a 32+ player local multiplayer game
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| I even had to unplug my mouse! | Play a 16+ player local multiplayer game
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| L+R+A+Start | Pause and quit a match right before you lose (Secret)
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| Legendary Unseen Fist | Punch every slime as punch slime in a single match
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| Lightning Rod | KO an opponent on the top branch of Rainbow Jungle while you stand on the ground
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| More Than a Crowd | Play a 4+ player local multiplayer game
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| Nothing Personal, Kid | As teleport slime KO a rainbow slime by teleporting inside the rainbow
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| Orbital Death Laser | KO 5 slimes with one beam as beam slime on celestial clock
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| Party Time | Play a 8+ player local multiplayer game
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| Rebel | Don’t press start. For 16 minutes. (Secret)
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| Rocks Fall, Everyone Dies | Get a KO as stone slime after dropping all the way from the top of the screen
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| Salmon Run | Catch a ride on Leia the salmon
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| Spin To Win | KO three slimes in one tornado slime spin attack
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| Strong Heart | Win a match without dying once
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| Technical Breakthrough | Complete an online match
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| Wavedash | As dash slime dash through wave slime’s wave and get a KO
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| Wrong Warp | Get a simultaneous KO with two teleport slimes
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| You’re not supposed to be here... | Transcend the bounds of the stage (Secret)
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| Your Name? | On Countryside Station get a cumulative 5,000 KO’s as stone slime (Secret)
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