Here is the full list of all 29 War Room achievements.
Successfully Medevac a unit
Complete the first mission
Defeat an enemy team that is stronger than our team without using air support
Defeat an enemy team that is over 2 times stronger than our team without using air support
Victory in all historical missions
Win a mission using only air support
After completing 20 medevac missions
Damage your own units
Use each type of support at least 3 times
Eliminate all big bosses terrorists
Endorse a candidate in an election event
Complete a candidate investigation
Eliminate a terrorist chieftain
Take control of all bases
Eliminate a terrorist boss
Reach Colonel rank
Win all terrorist hunt missions
Secure the elections
Reach PTSD ending
Reach good ending
Reach neutral ending
Reach bad ending
Complete the game within two in-game weeks
Have your vehicles drive over 25000 kilometres total
Retreat your troops from combat
Lose the game because of war crimes
Send your units 100 times on a H&M order
Send your units 100 times on a patrol order
Boost popularity and security in a single sector to 100%