Here are the secret achievements I’ve found so far for Star Wars: The Force Unleashed 2 for the Xbox 360.
A Measure of Mercy (20 points) – Complete the game and choose the Light Side ending
Betrayed By Rage (20 points) – Complete the game and choose the Dark Side ending
Bring Down the Giant (20 points) – Defeat the Gorog
Crack the Sky (20 points) – Destroy the Star Destroyer
Escape from Kamino (20 points) – Escape Kamino in Vader’s TIE Advanced
Meeting of the Jedi (20 points) – Reunite with Kota
Poor Bob (10 points) – Force Grip a Storm Trooper, impale him, hit him with lightning, then throw him into an object
The Exterminator (20 points) – Defeat the Terror Walker
The Nemesis in Flames (20 points) – Destroy the Gunship