Okay, so I went to the Achievements and cataloged all XIII chapters, so here we go: The Exodus: Bumblebee Defend the Ark and Metroplex Heeds the Call: Optimus Eye of the Storm: Cliffjumper and Jazz Cut and Run: Jazz and Swindle, possibly Swindle/Onslaught or Swindle/Brawl Death From Above: Vortex Belly of the Beast: Shockwave and/or Soundwave Combaticons, Combine!: Self-explanatory Spoiler Bruticus, if you feel like being cheap and not guessing Megatron Returns: In the title The Final Countdown: Possibly Wheeljack Starscream's Betrayal: In the title Grimlock, SMASH!: In title 'Till All Are One: Jetfire, Prime, Megatron
12 levels? Sweet, I hope each of them are at least 30 minutes long. I want to play the hell out of this game.
How do we know Jetfires in the last level ? I thought the achievement was just for either prime or megatron