Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Gold Star (15 points): Complete the first stage of the 1P Journey.
Gold, Mine (30 points): Complete the 1P Journey.
Mother Lode (15 points): Collect 8 bronze medals in Hang On (main game).
Big Ore-Deal (20 points): Complete 30 of the 1P Puzzles.
Double Up (15 points): Complete the first stage of the Co-op Journey.
Double Down (30 points): Complete the Co-op Journey.
Metal of Honor (10 points): Win 5 Last Man matches (original levels) on Xbox LIVE.
Gold Rush (10 points): Collect 5000 pieces of gold.
Treasure Hunter (15 points): Unearth 20 hidden enemies and steal their treasure.
Blast Off (10 points): Without blasting, collect all gold and complete level 3-1 of the 1P Journey.
Fool's Gold (15 points): Steal all gold from trapped enemies and complete level 3-1 of the 1P Journey.
Golden Rule (15 points): In a single game and without killing an enemy, complete the first stage of the 1P Journey.