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