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

Centurion (10 points): Earn a 100 hit combo.
250 Combo (10 points): Earn a 250 hit combo.
500 Combo (10 points): Earn a 500 hit combo.
Lucky 7's (10 points): Earn a 777 hit combo.
999 Combo (20 points): Max out the Combo Meter.
Power Surge (10 points): Activate the Power Meter 3 times in a song.
Multiplier Max (10 points): Reach the maximum multiplier (x8).
On the Career Path (10 points): Complete your first event in Career mode.
Going for Gold (10 points): Achieve a Gold rating for a Disc in Career Mode.
It's Gone Platinum (20 points): Complete all events on a Disc in Career Mode at any difficulty.
Song Aced (20 points): Complete a song to 100% on any difficulty.
Birth of a Legend (10 points): Finish a song performance on expert difficulty in Career or Quickplay.
Expert Song Aced (30 points): 100% any song on expert difficulty.
Gig Complete (20 points): Complete a poster gig at any difficulty level for an instrument.
Songs Complete (50 points): Complete all songs for an instrument in Career or Quickplay.
Expert Complete (80 points): Complete all songs on Expert Difficulty for an instrument in Career or Quickplay .
Career Complete (20 points): Complete Career mode for an instrument.
Platinum Career (50 points): Complete all Discs to Platinum standard for an instrument.
Distinguished Career (30 points): Reach a cumulative 'career points' total of 50,000,000 for an instrument.
Multi-talented Musician (20 points): Complete all Discs to at least Gold standard for both instrument Careers.
Professional Musician (20 points): Complete all discs to Platinum standard for both instrument Careers.
Session Player (30 points): Complete all Studio Recording challenges at expert difficulty for an instrument.
Thanks for the Memory (30 points): Complete all Band Practice challenges at expert difficulty for an instrument.
Hold it Together (30 points): Complete all Poison Note challenges at expert difficulty for an instrument.
Calmly Done (30 points): Complete all Crank It Up challenges at expert difficulty for an instrument.
Zoned Out (30 points): Complete all In The Zone challenges at expert difficulty for an instrument.
Look and Learn (10 points): Complete all tutorials for either instrument.
Dominator (10 points): Win 3 ranked Versus online games in a row.
Super-Dominator (20 points): Win 5 ranked Versus online games in a row.
Long Distance Relationship (10 points): Complete a song in an online co-op game.
Slick Player (20 points): Win a total of 10 ranked online games.
Virtuoso (20 points): Win a total of 50 ranked online games.
Class Act (20 points): Play a total of 50 online games.
Industry Veteran (20 points): Play a total of 100 online games.
Grudge match (10 points): Beat an online opponent on your friends list.
Show Off (10 points): Hit 100% notes in any online game.
Band Together (10 points): Compete in a six player Band Battle and be in the winning band!.
Party On (10 points): Complete a song in a local co-op session.
King of the Castle (10 points): Win 10 local multiplayer VS sessions.
Get Out of My House (10 points): Win 5 local multiplayer VS sessions in a row.
Internship (20 points): Create a song using the song generator in Studio Mode.
Producer (10 points): Save a song you have created in Studio Mode.
More Tracks Please (20 points): Record on all 8 tracks in Studio Mode.
Heard 'em All (30 points): Try out all the instrument sounds in Studio Mode.
Taking It Slow (10 points): Hit all notes in an expert song at 50% speed in rehearsal.
Back from the Brink (10 points): Recover a song performance from the red warning level in Career or Quickplay.
Multiple Identities (25 points): Complete at least one song performance with each of the characters in Career or Quickplay.
Illustrious Guitar Career (20 points): Complete all album and gig events in the guitar career at Expert difficulty.
Illustrious Drum Career (20 points): Complete all album and gig events in the drum career at Expert difficulty.
Your First Million (25 points): Score 1,000,000 points for a song in Career or Quickplay.