Here is the full list of all 20 Age of Steel: Recharge achievements.
Complete level Hilltown
Complete Act I
Complete Act II
Complete Act III
Complete Act IV
Complete campaign
Improve your base to the maximum level
Earn 10,000 resources
Earn 50,000 resources
Earn 100,000 resources
Buy level in Survival mode
Buy 7 levels in Survival mode
Buy all levels in Survival mode
Build a 12 walls at the same time
Destroy 100 enemy ground units
Destroy 100 enemy aircraft units
Destroy 100 enemy ships
Destroy 100 enemy units per session in Survival mode
Destroy 500 enemy units per session in Survival mode
Destroy 1000 enemy units per session in Survival mode