Here is the full list of all 34 Screencheat achievements.
Spend 10 seconds off the ground without dying on Holy Mountain
Reach level 50
Kill an opponent through multiple objects with the wall_Hacker
Get a multi-kill from beyond the grave with the Bearbomb
Get a quad-kill including yourself
Kill an opponent inside the center tunnel on Loop
Kill someone in the hill when they have 1 second to win
Fire 50 grenades in Hill Campers and win
Kill 5 Opponents from on top of the dinosaur in the Museum
Win a round without ever missing a shot on Temple
Spend over 75% of a round charging with the Hobby Horse
Get a mutli-kill with a projectile weapon through a vent
Reach level 25
Kill 3 opponents from behind with the Candelabra
Win a round of Murder Mystery without being killed
Get 4 kills without reloading the Revolver Rifle
Get a double kill with a returning Sörgeån
Reach level 5
Play a perfect round of deathmatch with the Blunderbuss
Stay in one place in the Garden for 1 minute
Kill 1 opponent from each coloured area in Helix
Play 20 rounds in a row in Party Mode
Get a multi-kill in One Shot
Kill an Opponent inside a vent on the Manor
Get a quad kill or more with a single Chefolet ball
Harpoon 2 players in one shot with the Trappeur
Get 1 kill with each weapon in a round
Play 5 games with 4 local players
Kill 5 players from the moving platforms on Steeple
Get 3 kills whilst bouncing on the floating cushions.
Win a round on Ascension in less than 30 seconds with the default mode settings
Get a Bronze medal or higher on all training missions.
Get a Silver medal or higher on all training missions.
Get a Gold medal on all training missions.