Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Bialystok defended	As Poland, hold Bialystok until 20th September.
Bialystok taken	As Germany, capture Bialystok before 10th September.
Bielsko defended	As Poland, hold Bielsko until 4th September.
Bielsko Taken	As Germany, capture Bielsko before 3rd September.
Brest defended	As Poland, hold Brest-on-the-Bug until 20th September.
Brest taken	As USSR, capture Brest-on-the-Bug before 19th September.
Bring the Revolution	As Soviet Union, destroy 50 Polish units in single game.
Bydgoszcz defended	As Poland, hold Bydgoszcz until 6th September.
Bydgoszcz taken	As Germany, capture Bydgoszcz before 3rd September.
Capturing the Peninsula	As Germany, capture Hel before 7th September.
Casualties	Destroy 1000 strength points in any number of plays.
Cavalry Is Outdated	As Germany, destroy 20 Polish cavalry units before 7th September.
Chelm defended	As Poland, hold Chelm until 26th September.
Chelm taken	As Germany, capture Chelm before 15th September.
Cracow defended	As Poland, hold Cracow until 8th September.
Cracow taken	As Germany, capture Cracow before 4th September.
Cutting Off The Corridor	As Germany, cut off the Polish Corridor before 5th September.
Czestochowa defended	As Poland, hold Czestochowa until 5th September.
Czestochowa taken	As Germany, capture Czestochowa before 3rd September.
First Blood	Destroy an enemy unit.
Gdynia defended	As Poland, hold Gdynia until 20th September.
Gdynia taken	As Germany, capture Gdynia before 10th September.
Heavy Casualties	Destroy 10000 strength points in any number of plays.
Hel Peninsula	As Poland, hold Hel until 2nd October.
Hrodna defended	As Poland, hold Hrodna until 25th September.
Hrodna taken	As USSR, capture Hrodna before 20th September.
Huge Casualties	Destroy 100000 strength points in any number of plays.
Inowroclaw defended	As Poland, hold Inowroclaw until 10th September.
Inowroclaw taken	As Germany, capture Inowroclaw before 5th September.
K-bur	As Poland, destroy at least 20 German panzer regiments before 26th September.
Kalisz defended	As Poland, hold Kalisz until 5th September.
Kalisz taken	As Germany, capture Kalisz before 3rd September.
Katowice defended	As Poland, hold Katowice until 5th September.
Katowice taken	As Germany, capture Katowice before 3rd September.
Kielce defended	As Poland, hold Kielce until 7th September.
Kielce taken	As Germany, capture Kielce before 5rd September.
Lodz defended	As Poland, hold Lodz until 12th September.
Lodz taken	As Germany, capture Lodz before 6th September.
Lublin defended	As Poland, hold Lublin until 20th September.
Lublin taken	As Germany, capture Lublin before 15th September.
Lvov defended	As Poland, hold Lvov until 26th September.
Lvov taken	As USSR, capture Lvov before 20th September.
Mlawa taken	As Germany, capture Mlawa before 3rd September.
Northern Fortress	As Germany, capture Modlin before 23rd September.
Panzerschreck	Destroy 500 enemy armored units in any number of plays.
Pillbox	Destroy 50 enemy units with units positioned on fortifications in any number of plays.
Plock taken	As Germany, capture Plock before 6th September.
Polish Soviet Republic	As USSR, capture Warsaw without entering war with Germany.
POW	Make an enemy unit surrender.
Pozna defended	As Poland, hold Poznan until 12th September.
Poznan taken	As Germany, capture Poznan before 7th September.
Przemysl taken	As Germany, capture Przemysl before 10th September.
Radom taken	As Germany, capture Radom before 5th September.
Rzeszow taken	As Germany, capture Rzeszow before 6th September.
Slovakian Tatras	As Slovakia, capture Jaslo before 4th September.
Take No Prisoners	Make an enemy unit withdraw.
Torun defended	As Poland, hold Torun until 10th September.
Torun taken	As Germany, capture Torun before 5th September.
Tuchola Forest	As Germany, capture the whole Tuchola Forest.
Vilnius defended	As Poland, hold Vilnius until 22nd September.
Vilnius taken	As USSR, capture Vilnius before 19th September.
Warsaw Has Fallen	As Germany, capture Warsaw before 20th September.
Wloclawek defended	As Poland, hold Wloclawek until 16th September.
Wloclawek taken	As Germany, capture Wloclawek before 10th September.