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

Clear Round 4 (10 points): Clear Round 4.
Clear Round 8 (20 points): Clear Round 8.
Clear Round 12 (25 points): Clear Round 12.
Clear Round 16 (30 points): Clear Round 16.
No-Miss (Round 7) (40 points): Clear the first 7 rounds without losing a life.
Extend (10 points): Score 20000 points and gain an extra life.
Double Extend (20 points): Score 100000 points and gain a second extra life.
Special Flag (5 points): Collect the Special Flag.
Special Flag First (10 points): Collect the Special Flag before collecting any other flag.
No-Miss Special Flag (15 points): Collect the Special Flag before collecting another flag and finish the stage without losing a life.
Lucky Flag (5 points): Collect the Lucky Flag.
Fuel Bonus (10 points): Collect a Lucky Flag with more than half fuel remaining.