Here is the full list of all 43 Door Kickers achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Unlock the Shield Class
Kill 10 bad guys within 5 seconds, without letting them fire a shot.
Hit 5 enemies with the same Flashbang.
Get 13 stars
Complete 10 missions
Unlock the Assaulter class
Get your first Perfect Plan Medal
Get your first No Pause Medal
Get a 3 star result as an "improved result" on a mission
Complete 150 missions.
Kill 1000 enemies.
Arrest 100 enemies.
Breach 400 doors.
Fire a total of 10000 rounds.
Walk total 10000 meters.
Get one star in every Single Mission.
Get two stars in every Single Mission.
Get three stars in all Single Missions.
Get 30 Perfect Plan Medals.
Get 30 One Man Army Medals.
Get 30 No Pause Medals.
Defuse a bomb with less then 1 second left.
Fully complete campaign "A Hard Day's Work"
Fully complete campaign "Drug Bust"
Fully complete campaign "The Cell"
Win a campaign in Iron Man Mode.
Level-up your squad to maximum level.
Level-up a trooper to maximum level.
Have a squad of fully leveled up troopers.
Unlock all equipment / weapons.
Complete a mission arresting 6 or more bad guys and without killing any.
Have your entire team killed at roughly the same time after unpausing the game, within seconds of mission start.
Defuse 100 bombs.
Have a shield unit kill three enemies without moving.
Fully complete campaign "Terror at Sea"
Fully complete campaign "Suits and Ski-Masks"
Get 50 stars
Save your first hostage
Defuse your first bomb
Handcuff your first bad guy
Get your first One Man Army Medal
Unlock the Breacher class
Unlock all playable classes