Here is the complete list of achievements for Transformers: Dark of the Moon on the Xbox 360. There is one secret achievement that is listed at the bottom in its own section.
Autobots are Weak! (25) – Defeat all 3 waves in Megatron’s Lair without dying on Hard Difficulty in Chapter VI
Body Count (25) – While holding out for Reynolds to send backup in Chapter III, 30 Decepticons are killed
Boot Stomper (25) – Kill 3 Enemies with Bumblebee’s Kick Ability in Chapter I
Chapter I (25) – Complete Chapter I on any difficulty
Chapter II (25) – Complete Chapter II on any difficulty
Chapter III (25) – Complete Chapter III on any difficulty
Chapter IV (25) – Complete Chapter IV on any difficulty
Chapter V (25) – Complete Chapter V on any difficulty
Chapter VI (25) – Complete Chapter VI on any difficulty
Chapter VII (25) – Complete Chapter VII on any difficulty
Completionist (25) – Destroy all hidden TRANSFORMERS symbols in Campaign mode
Counting Coup (25) – Use only melee attacks on Shockwave’s power core to make him retreat to his cryo platform
Fleet of Foot (25) – When one Driller arm is attacking, avoid all attacks in Chapter VII
Furious Flyer (25) – Fly through the canyons after Air Raid in 120 seconds in Chapter V
Good Driver Discount (25) – Avoid taking any damage from Starscream’s proximity mines in Chapter III
Grenade Expert (25) – Eliminate 20 opponents with the Flak Grenade in Campaign mode
Homewrecker (25) – Wipe out all secret base ground defenders within 60 seconds in Chapter V
I know what I’m doing! (25) – Change into vehicle form before reaching the change form tutorial in Chapter I
Overlord (25) – Drain 5000 health from enemies in Chapter VI
Power Surge (25) – Use an active ability 5 times in a public multiplayer match
Prime (125) – Complete the Campaign
Primed for Combat (25) – Activate Optimus’ Shoulder Rocket ability 5 times without dying in Chapter VII
Recruit (25) – Survive 60 seconds in a public multiplayer match without being killed
Road Kill (25) – Destroy 30 enemies while in vehicle form in Campaign mode
Rule With An Iron Fist (25) – Kill 20 enemies with Ironhide’s Melee attack in Chapter II
Seek and Destroy (25) – Kill 25 Enemies using Grenade Blossom in Chapter II
Serrated (25) – Kill 10 Autobots with Laserbeak’s ram ability in Chapter IV
Stunning! (25) – Stun 10 Autobots with Soundwave’s stun ability in Chapter IV
Surprise Package (25) – In the air battle, activate Starscream’s Guided Missile ability 5 times without dying in Chapter V
The Champion (25) – Reach level 20 in any single class in Multiplayer
Top Score: Bumblebee (25) – Complete Chapter I with a score of 1,000,000 or more
Top Score: Ironhide (25) – Complete Chapter II with a score of 1,000,000 or more
Top Score: Megatron (25) – Complete Chapter VI with a score of 2,000,000 or more
Top Score: Mirage (25) – Complete Chapter III with a score of 800,000 or more
Top Score: Soundwave (25) – Complete Chapter IV with a score of 1,000,000 or more
Here is the one unlockable secret achievement that isn’t listed on the achievements page until it’s unlocked:
Sacrifice (25) – Be the first one eliminated in a public multiplayer match