Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Can't get enough (25 points)	Kill over 1987 Red Dudes in endless mode.
Conserve Ammo (10 points)	Kill 3 Red Dudes with one shotgun shot.
Dudes (15 points)	Kill 100 Red Dudes using melee.
Full Package (50 points)	Unlock all endless levels.
Get REDy (125 points)	Get RED ending in every level of SPEEDRUNrt challenge.
Hercules (200 points)	Beat all Challenges.
Just (15 points)	Kill 100 Red Dudes with a pistol.
Killing (15 points)	Kill 100 Red Dudes with a shotgun.
Pointless but cool (25 points)	Score 100 headshots.
Ratatatata! (10 points)	Kill 3 Red Dudes with one rifle burst.
Red (15 points)	Kill 100 Red Dudes with a rifle.
Shishkebap (10 points)	Kill 2 Red Dudes with one katana throw.
Spread the system (15 points)	Capture the replay.
Stand REDy (125 points)	Get RED ending in every level of SPEEDRUN challenge.
With Katana (15 points)	Kill 100 Red Dudes with a katana.