Alien Hallway achievements

26.83%

Professional

Complete the game on extreme level of difficulty

31.71%

Specialist

Upgrade one unit till 10th level

32.93%

Extreme

Win the battle with lower than 50% health level of your base

34.15%

Perfectionist

Get 5 stars for all game levels

37.80%

Master of defense

Upgrade the base till 5th level

37.80%

Great commander

Upgrade all friendly units till 4th level

39.02%

Invincible

Complete any level of the last planet without loss of friendly units

41.46%

Air force

Upgrade airstrike till 7th level

48.78%

Liberator

Complete all game levels

53.66%

Air supply

Use airstrike 100 times

54.88%

Elite only!

Call for 5 Heavy laser gunners during the battle

56.10%

Phantom warrior

Have 10 Snipers simultaneously present during the battle