Here is the full list of all 50 R.U.S.E achievements.
Defeat an A.I. in battle mode
Complete all cooperative operations
Play a game on every map in a ranked match
Play a game with a stranger in team ranked match
Win 5 games with every nation in ranked matches
Play a game with a friend in the same team
Achieve a victory in every ranked match mode
Play a four-player or more game with your friends only
Complete an operation
Reach the Elite league.
Use all RUSEs
Play two RUSEs on the same sector
Get to level 20
Reach the Veteran league.
Capture 50 buildings
Achieve a winning streak of 10 in ranked matches
Achieve a 200% or more kill rate in a ranked match
Achieve a winning streak of 3 in ranked matches
Defeat an opponent without using the airfield and armor and artillery base camps in a ranked match
Defeat one of Eugen Systems' team or someone having already unlocked this achievement
Defeat an opponent with air units only in a ranked match
Achieve a 90% or more survival ratio in a ranked match
Seize Colditz Castle
Successfully hold Kasserine Pass
Throw the Axis out of Africa
Neutralize the Italian secondary HQ by moving from cover to cover
Eliminate the last Italian forces
Complete the Italian Campaign
Successfully land at Utah Beach
Complete the Cotentin Campaign
Complete Operation Market Garden
Successfully hold Bastogne
Survive to see the German capitulation
Recover Germany's secret weapon plans
Prevent the Russians from attacking the western allies
Prevent World War III in Easy difficulty level
Prevent World War III in Medium difficulty level
Prevent World War III in Hard difficulty level
Complete 50% of the secondary objectives from the Campaign.
Complete all the secondary objectives from the Campaign.
Complete all operations' bonus objectives
Complete all 1 vs. all operations
Complete all 1 vs. 1 operations
Complete all operations
Defeat an A.I. in battle mode on Medium difficulty level and in all time periods (39/42/45)
Defeat an A.I. In battle mode on Hard difficulty level with Total victory
Defeat an A.I. in battle mode while playing each nation
Defeat all A.I. profiles in 1v1 battle at least in Medium difficulty
Destroy 5000 enemy units
Get to level 100