Here is the full list of all 51 Door Kickers: Action Squad achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Use sniper support to kill 1000 enemies
Win one mission in Coop
Resurrect another player 5 times in the same mission
Kill 3 enemies by blowing up one barrel
Disarm 30 bombs
Blow Open 100 Doors
Use 5 extra lives in the same mission
Kill 50 Hostages
Get 100 kills as Recon
Get 100 kills as Agent Fergie
Get 100 kills as Shield
Kill 3 enemies with one breaching charge
Get 100 kills as Breacher
Collect all 20 secret items
Kill yourself with your own explosives
Rescue 1000 hostages
Successfully complete all missions in Chapter 5
3-Star all missions in Chapter 5
Rescue 50 Wounded Policemen
Make 5 VIP Arrests
Successfully complete all missions in Chapter 4
3-Star all missions in Chapter 4
Kick Open 1000 Doors
Unlock Chapter 5
Unlock Chapter 4
3-Star all missions in Chapter 3
Successfully complete all missions in Chapter 3
Successfully complete all missions in Chapter 2
3-Star all missions in Chapter 2
Unlock Chapter 3
Use sniper support to kill 100 enemies
Stun 500 enemies
Kill 1000 bad guys
Unlock Chapter 2
Successfully complete all missions in Chapter 1
3-Star all missions in Chapter 1
Set 20 enemies on fire
Kick Open 100 Doors
Kill an enemy with an elevator
Rescue 50 hostages
Complete a level without taking any damage whatsoever
Get 100 kills as Assaulter
Collect your first secret item
Kill 50 bad guys
Get 3 stars in a mission