Here is the full list of all 33 Panzer Knights achievements.
Complete the mission "Fall Weiss"
Complete the mission "Pass the Ardennes"
Complete the mission "Battle of Montcornet"
Complete the mission "Occupy Boulogne-sur-Mer"
Complete the mission "Road to English Channel"
Complete the mission "Operation Barbarossa Ⅰ"
Complete the mission "Operation Barbarossa ⅠⅠ"
Complete the mission "Operation Barbarossa ⅠⅠⅠ"
Complete the mission "Operation Typhoon"
Complete the mission "Operation Winter Storm"
Complete the mission "The Battle of Kursk"
Upgrade the skill 10 times
Upgrade the skill 30 times
Upgrade the skill 50 times
Upgrade the skill 80 times
Upgrade the skill 120 times
Hire 5 Crews
Hire 10 Crews
Hire 20 Crews
Unlock 5 camo
Unlock 10 camo
Unlock 20 camo
Unlock 2 tanks
Unlock 10 tanks
Unlock 20 tanks
Destroy 10 tanks
Destroy 50 tanks
Destroy 100 tanks
Destroy 200 tanks
Unlock 5 memoir of friendship
Unlock 10 memoir of friendship
Unlock 15 memoir of friendship
Unlock 5 tanks