Here is the full list of all 33 ProtoGalaxy achievements.
Turret Defense: Lose 200% health on the planet (single or multiplayer).
Turret Defense: Beat all boss types without upgrading (single or multiplayer).
Turret Defense: Have all boss types in play (single or multiplayer).
Turret Defense: Have 40 turrets in play (single or multiplayer).
Complete the Security Zone mission without taking more than 25% damage (single player, normal difficulty or harder).
Turret Defense: Get to round 13 (single or multiplayer).
Complete ProtoForce: Alpha Op on Hard difficulty (single or multiplayer).
Fly through all markers in the Battle Ship mission (single player, normal difficulty or harder).
Complete the Factory mission without using the gravity beam on anything other than keys (single player, normal difficulty or harder).
Destroy all Pearl and Spider enemies in the Front Line mission (single player, normal difficulty or harder).
Turret Defense: Sell 20 turrets (single or multiplayer).
Complete the Black Hole mission using only the gravity beam (single player, normal difficulty or harder).
Complete the Power Plant mission in under 5 minutes (single player, normal difficulty or harder).
Find the final secret.
Complete the Derelict mission without revisiting any room (single player, normal difficulty or harder).
Complete the Assault mission while keeping Earth's shield above 70% (single player, normal difficulty or harder).
Create a mine constellation in the Fort (single player, normal difficulty or harder).
Complete the Reactor mission without using any battery (single player, normal difficulty or harder).
Collect all blueprints (single or multiplayer, any difficulty).
Use the copper key to open the lock in the Scrap Yard (single player, normal difficulty or harder).
Complete the Rally Point mission without moving (single player, normal difficulty or harder).
Turret Defense: Get to round 5 (single or multiplayer).
Collect 7500 money (single or multiplayer, any difficulty).
Complete ProtoForce: Alpha Op on Normal difficulty (single or multiplayer).
Complete ProtoForce: Alpha Op on Easy difficulty (single or multiplayer).
Complete the tutorial (single player, normal difficulty or harder).
Complete the Substructure mission without destroying any enemies (single player, normal difficulty or harder).
Defeat the Mind without hitting any levers in the boss room (single player, normal difficulty or harder).
Use the moving Proton Cannon to destroy 20 enemies (single player, normal difficulty or harder).
Complete the Barricades mission without looking back (single player, normal difficulty or harder).
Turret Defense: Have 750 money on hand (single or multiplayer).
Create a new map in the editor.
Destroy 500 enemies in the Credits mission (single player, normal difficulty or harder).