You can unlock the following characters for Escalation and Multiplayer mode.
By beating the Autobot campaign you get Arcee.
To unlock Slipstream, all you have to do is beat the Decepticons campaign for once.
Unlimited Ammo Cheat
If you want unlimited ammo during your campaign then you should download this trainer.This will override the ammo limit and you can fire for unlimited times without worrying about ammo.
This trainer is meant for the original version of the game, updated versions may not support it.
Achievements and Trophiesfor PS3
There are almost 37 Bronze Trophies, 12 Silver Trophies, 1 Gold Trophy, and 1 Platinum Trophy to unlock in PS3.
Beak Breaker (Bronze)
Shoot the 3 Hidden Laserbeaks throughout Kaon Prison Break.
Destroy 100 Spiders in Campaign or Escalation.
Ignite a Brute’s back 5 times in Campaign or Escalation.
Chaos Bringer (Bronze)
Destroy the planets in the Stellar Galleries in Iacon Destroyed.
Dark Energy (Bronze)
Complete Dark Energon (on any difficulty).