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