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