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