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