Here is the full list of all 10 WARNO achievements.
Complete operation Hold Until Relieved in any difficulty
Complete operation The Dieburg Salient in any difficulty
Complete operation Götterdammerung on any difficulty
Complete operation The Kitzingen Ruse on any difficulty
Complete operation Sledgehammer in any difficulty
Complete operation Backhand Blow on any difficulty
Complete operation Red Juggernaut in any difficulty
Complete operation Black Horse's Last Stand in any difficulty
Complete Bruderkrieg campaign with NATO
Complete Bruderkrieg campaign with PACT