To unlock Xbox Live Gamerscore points, complete one of the following Achievements.

Achievement	How to unlock
Autobots are Weak! ( 25 points )	Defeat all 3 waves in Megatron's Lair without dying on Hard Difficulty in Chapter VI.
Body Count ( 25 points )	While holding out for Reynolds to send backup in Chapter III, 30 Decepticons are killed.
Boot Stomper ( 25 points )	Kill 3 Enemies with Bumblebee's Kick Ability in Chapter I.
Chapter I ( 25 points )	Complete Chapter I on any difficulty.
Chapter II ( 25 points )	Complete Chapter II on any difficulty.
Chapter III ( 25 points )	Complete Chapter III on any difficulty.
Chapter IV ( 25 points )	Complete Chapter IV on any difficulty.
Chapter V ( 25 points )	Complete Chapter V on any difficulty.
Chapter VI ( 25 points )	Complete Chapter VI on any difficulty.
Chapter VII ( 25 points )	Complete Chapter VII on any difficulty.
Completionist ( 25 points )	Destroy all hidden TRANSFORMERS symbols in Campaign.
Counting Coup ( 25 points )	Use only melee attacks on Shockwave's power core to make him retreat to his cryo platform.
Fleet of Foot ( 25 points )	When one Driller arm is attacking, avoid all attacks in Chapter VII.
Furious Flyer ( 25 points )	Fly through the canyons after Air Raid in 120 seconds in Chapter V.
Good Driver Discount ( 25 points )	Avoid taking any damage from Starscream's proximity mines in Chapter III.
Grenade Expert ( 25 points )	Eliminate 20 opponents with the Flak Grenade in Campaign.
Homewrecker ( 25 points )	Wipe out all secret base ground defenders within 60 seconds in Chapter V.
I know what I'm doing! ( 25 points )	Change into vehicle form before reaching the change form tutorial in Chapter I.
Overlord ( 25 points )	Drain 5000 health from enemies in Chapter VI.
Power Surge ( 25 points )	Use an active ability 5 times in a public multiplayer match.
Prime ( 125 points )	Complete the Campaign.
Primed for Combat ( 25 points )	Activate Optimus' Shoulder Rocket ability 5 times without dying in Chapter VII.
Recruit ( 25 points )	Survive 60 seconds in a public multiplayer match without being killed.
Road Kill ( 25 points )	Destroy 30 enemies while in vehicle form in Campaign.
Rule With An Iron Fist ( 25 points )	Kill 20 enemies with Ironhide's Melee attack in Chapter II.
Sacrifice ( 25 points )	Be the first one eliminated in a public multiplayer match.
Seek and Destroy ( 25 points )	Kill 25 Enemies using Grenade Blossom in Chapter II.
Serrated ( 25 points )	Kill 10 Autobots with Laserbeak's ram ability in Chapter IV.
Stunning! ( 25 points )	Stun 10 Autobots with Soundwave's stun ability in Chapter IV.
Surprise Package ( 25 points )	In the air battle, activate Starscream's Guided Missile ability 5 times without dying in Chapter V.
The Champion ( 25 points )	Reach level 20 in any single class in Multiplayer.
Top Score: Bumblebee ( 25 points )	Complete Chapter I with a score of 1000000 or more.
Top Score: Ironhide ( 25 points )	Complete Chapter II with a score of 1000000 or more.
Top Score: Megatron ( 25 points )	Complete Chapter VI with a score of 2000000 or more.
Top Score: Mirage ( 25 points )	Complete Chapter III with a score of 800000 or more.
Top Score: Soundwave ( 25 points )	Complete Chapter IV with a score of 1000000 or more.