Here is the full list of all 26 SUPERHOT achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Become part of the community.
Kill 100 Red Dudes with a rifle.
Kill 100 Red Dudes with a katana.
Launch every app in the system.
Kill 100 Red Dudes with a shotgun.
Upload a replay on killstagram.com
Kill 2 Red Dudes with one katana throw.
Kill 100 Red Dudes using melee.
Kill an enemy by jumping on him.
Complete the game.
Score 100 headshots.
Cut bullet with a katana.
Get back to the system after being expelled.
Kill 100 Red Dudes with a pistol.
Complete SERV level.
Shoot down a bullet with a bullet.
Complete SUBWAY level.
Kill over 1987 Red Dudes in endless mode.
Kill 3 Red Dudes with one shotgun shot.
Kill 3 Red Dudes with one rifle burst.
Unlock all endless levels.
Find all secrets.
Beat all Challenges.
Get RED ending in every level of SPEEDRUN challenge.
Get RED ending in every level of SPEEDRUNrt challenge.