Here is the full list of all 23 ZHEROS achievements.
The base game contains 20 achievements, and there is 1 DLC pack containing 3 achievements.
Deflect 100 bullets using the shield at the right time when the bullet is about to hit
Complete the game at any level of difficulty playing as Captain Dorian
Complete the game playing with a friend in local co-op
Complete the game at the level of difficulty Easy
Complete the first level
Revive your companion 5 times using the X button while standing above him/her on the ground
Reach a 100 combo streak hitting the enemies without pauses longer than 2 seconds. Using your gun or shield breaks the combo streak
Defeat the final boss Dr. Vendetta
Complete the game at any level of difficulty playing as Mike
Complete a level without using any medkit
Find all secret stars hidden in each level, there is a total of 18 stars
Break an enemy guard 100 times blocking its attack right before being hit
Complete the game at the level of difficulty Normal
Destroy 300 Screenman enemies
Complete all the levels of the first world
Complete the game at the level of difficulty Hard
Buy all upgrades
Complete a level without being hit
Complete all the levels of the second world
Complete the game without using any weapon
Complete the game defeating Dr.Vendetta
Stop 20 Sven Enemies from trasforming
Deflect 50 bullets using the vehicle shield