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