Here is the full list of all 31 Pummel Party achievements.
Take no damage in 'Searing Spotlights' minigame
Complete 'Slippery Sprint' without falling in the water
Complete 'Rusty Racers' without falling off the track
Survive in 'Breaking Blocks' for 60 seconds
Got hit by the train in 'Temporal Trails'
Died in 'Acidic Atoll' throwing a barrel
Get launched off screen in 'Tunneling Tanks'
Find the treasure in 'Sandy Search'
Win 'Magma & Mages' without taking damage
Knock off 5 players in one game of 'Snowy Spin'
Start your first game
Win your first game
Steal the last gift in a players pile in 'Grifting Gifts'
Score over 5 in 'Bouncing Balls'
Collect 40 keys in 'Winter Maze'
Accidentally blew yourself up in the 'Strategic Shockwave' minigame
Control over 50% of the area in 'Elemental Escalation'
Get your first goal
Win your first minigame
Hit three players with the remote control eggplant
Skewer three players with the rocket skewer item
Place first in every minigame
Place last in every minigame
Get a double kill in 'Barn Brawl'
Survive for 50 seconds in 'Bullet Barrage'
As the lightning holder kill every other player in 'Thunderous Trench'
Knockout 10 players in one game of 'Explosive Exchange'
Survive for at least 50 seconds in 'Sorcerers Sprint'
Get a 5 player kill sreak in 'Speedy Sabers'
Complete 'Gift Grab' without collecting coal