Here is the full list of all 30 Timelines: Assault on America achievements.
Earn 200 points
Destruction of first enemy unit encountered
Destroy 500 Enemy Units
Destroy 2500 Enemy Units
Deployment of first Airstrike
100 Airstrike Attacks deployed
Deployment of first Minefield
50 Minefields deployed
10 multiplayer games won
50 multiplayer games won
Earn 400 points
Earn 600 points
Earn 800 points
Earn 1000 points
Earn 1200 points
Earn 1400 points
Earn 1600 points
Earn 1800 points
Earn 2000 points
Earn 2200 points
Earn 2400 points
Earn 2600 points
Earn 2800 points
Earn 3000 points
Earn 3200 points
Earn 3400 points
250 Airstrike Attacks deployed
250 Minefields deployed
250 multiplayer games won
Completed single player campaign