Full list of all 23 Ready or Not achievements. It takes around 0-1 hour to unlock all of the achievements in the base game on Windows.
The base game contains 15 achievements, and there is 1 DLC pack containing 8 achievements.
Arrest your first suspect or civilian
Complete ‘Thank You, Come Again’, ‘Rust Belt’ and ‘Twisted Nerve’ at C+.
Complete ‘Elephant’, ‘Relapse’ and ‘Neon Tomb’ at C+.
Complete ‘Carriers of the Vine’, ‘Sins of the Father’, ‘Ides of March’, and ‘A Lethal Obsession’ at C+.
Complete ‘Buy Cheap, Buy Twice', ‘Hide and Seek', 'Ends of the Earth’, and 'Greased Palms’ at C+.
Complete ‘The Spider’, ‘Valley of the Dolls’, ‘Sinuous Trail’, and '23 Megabytes a Second' at C+.
Complete all levels at S.
Complete Ready or Not in Ironman mode.
Complete Ready or Not in Ironman mode without losing a single officer.
Complete Port using only a taser, flashbangs, and bash.
Complete Coyote using only .357 Magnum as a weapon.
Use the secret command for your SWAT team (kill me command)
Arrest a downed suspect only to find out they were faking it.
Be killed by a civilian.
Incapacitate a suspect with a C2 charge.
Complete ‘Dorms’ at C+
Complete ‘Lawmaker’ at C+
Complete ‘Narco’ at C+
Complete ‘Narco’ using only lethal pistols but without using grenades or launchers.
Restrain all civilians in ‘Lawmaker’ without neutralizing any suspects.
Complete all Home Invasion levels at S.
Complete all ‘Dorms’ main objectives in two minutes.
Get all Ready Or Not Home Invasion DLC achievements.