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