Here is the full list of all 54 Forts achievements.
The base game contains 21 achievements, and there are 2 DLC packs containing 33 achievements.
Complete all campaign missions
Complete all campaign missions on Hard
Reach the end of the campaign
Complete campaign on Hard
Complete all mission achievements
All part 3 theatre medals acquired
All part 3 theatre medals acquired (Hard)
Complete part 3 of the campaign
Complete part 3 of the campaign (Hard)
All part 2 theatre medals acquired
All part 2 theatre medals acquired (Hard)
Complete part 2 of the campaign
Complete part 2 of the campaign (Hard)
All part 1 theatre medals acquired
All part 1 theatre medals acquired (Hard)
Play 10 ranked multiplayer battles
Play 10 multiplayer games
Complete part 1 of the campaign
Complete part 1 of the campaign (Hard)
Tutorials complete