Complete each achievement to get the allotted gamerscore. The numbers between the () is the points given for each achievement.
|Achievement||How to unlock|
|Let's Get Punchy (15)||Melee 5 soldiers|
|Bomba Punter (20)||Punt 20 Bombas|
|My Head A-splode (20)||Get 50 headshots|
|Make 'Em Scream (20)||Get 100 soldiers to scream|
|To Kill a Blackbird (15)||Destroy the helicopter attacking the vice president|
|Look Out! (5)||Kill a soldier with a Bomba|
|Walkin' on Water (5)||Make it from one end of the lake to the other in hyperspeed|
|Hero (50)||Complete the game on any difficulty setting|
|Completionist (20)||Complete the game with 100% of the items|
|Minimalist (10)||Complete the game with less than 13% of items|
|Proven Grounds (10)||Complete the three challenge packs in the Proving Grounds|
|Serious Complex (10)||Level up to experience level 50|
To get this master challenge "like an achievement for the game" you have to go to the jeep (the place you start the game at). Once there, press B in front of the jeep. You will trigger a special ending.
There are ealier times to get this, but the easiest way is to wait until you have the Omega armour. Stay on the land (top part of the map) and keeping walking over 'till you get to the jeep. Then, press B.
If you are having a hard time leveling, try to.....
1. Play on insane/ a harder difficulty, it nets you more experience.
2. Try to find all gold bars, gold guns give you twice the experience.
3. You don't get most experience killing people, you get most from bosses and exploring, so explore!
Special things you will unlock every ten levels;
Level 10: Extra 100 health
Level 20: Full Map Revealed
Level 30: Infinite Foam ammo
Level 40: Infinite Grenade ammo
Level 50: Infinite Missile ammo (and an achievement)