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