| Achievement | How to unlock | Points
|
|---|
| Bang! Bang!! Bang!!! (secret) | Performed 10x hits. | 15
|
| Big Dora (secret) | Defeated Big Dora. | 75
|
| Can't Touch This (secret) | Complete a stage without receiving a single hit. | 30
|
| Dread Feller (secret) | Defeated Dread Feller. | 15
|
| Hey, Watch It! (secret) | Been bumped into by a supply robot. | 15
|
| Housing Crisis at Area 51 | Shot down 500 UFOs. | 10
|
| Legion Acquainted | Completed all campaigns under noob difficulty. | 15
|
| Legion Confrontation | Completed all campaigns under normal difficulty. | 45
|
| Legion Devastation | Completed all campaigns under veteran difficulty. | 75
|
| One for the Books | Scored 2,500,000 points or more during any single stage. | 75
|
| Someone Likes Me | Played in Local CO-OP Mode. | 15
|
| Terror Cracker (secret) | Defeated Terror Cracker. | 15
|
| The golden medal of Noob: Part 1 (secret) | Defeat all enemies in Stage 1(Noob). | 30
|
| The golden medal of Noob: Part 2 (secret) | Defeat all enemies in Stage 2(Normal). | 45
|
| The golden medal of Noob: Part 3 (secret) | Defeat all enemies in Stage 3(Noob). | 75
|
| The golden medal of Normal: Part 1 (secret) | Defeat all enemies in Stage 1(Normal). | 30
|
| The golden medal of Normal: Part 2 (secret) | Defeat all enemies in Stage 2(Noob). | 30
|
| The golden medal of Normal: Part 3 (secret) | Defeat all enemies in Stage 3(Normal). | 75
|
| The golden medal of Normal: Part 4 (secret) | Defeat all enemies in Stage 4(Normal). | 75
|
| The golden medal of Normal: Part 5 (secret) | Defeat all enemies in Stage 5(Normal). | 90
|
| The Lord of War (secret) | Defeated the Lord of War. | 45
|
| The Roaring Steam (secret) | Defeated the Roaring Steam. | 45
|
| Turborghini (secret) | Defeated Turborghini. | 30
|
| War Gear III (secret) | Defeated War Gear III. | 30
|