
Here's my updated progress:
Halo 3: Legendary difficulty in solo mode
-done
Rainbow Six Vegas: Realistic Difficulty in solo mode
-done
Rainbow Six Vegas 2: Realistic difficulty in solo mode
-done
Gears of War: Insane difficulty in solo mode
-done
Gears of War 2: Insane difficulty in solo mode
-done
Mirror's Edge: Hard difficulty
-done
Halo 3 ODST: Legendary difficulty in solo mode
-done
Assassin's Creed 2: 100% completion, all feathers and items found
-done
Mass Effect 2: Insanity difficulty
-approx. halfway with vanguard (tip: vanguard is unbalanced and weak on high difficulty, attempt this with a different class)
Assassin's Creed: 100% complete
-Templars, Jerusalem flags and Damascus Flags still needed
Project Gotham Racing 4: Receive a platinum medal in every arcade event
-approx. 20% complete
Splinter Cell Conviction: Realistic difficulty in single player
-10% complete