Here is the full list of all 31 Double Action: Boogaloo achievements.
Kill with a headshot at point blank range
Dive away from an explosion for reduced damage.
Fatally melee a mook whilst mainly moving in midair
Get 250 Divepunch Kills
Dive away from explosions for reduced damage 250 times.
Kill a player with their own weapon.
Get like a bajillion divepunch kills. Then resolve never to divepunch again. You monster.
Kill someone with a headshot after flipping off them. Damn that's hardcore.
Get a 250 kill streak and enter the annals of legend
Accumulate 1,000,000 total style points
Get a brawl kill while superfalling
Get 3 kills during a single slowmo
Capture a briefcase without killing anyone
Get a long range pistol kill on a rifle-using player
Kill a player who has activated their super-slow ability
Get 50 kills while wanted