Movie Player: successfully complete the game. That’s all.
MP Soldier Skin: successfully complete the game on the Superhuman difficulty setting and you will get it!
Getting Bonuses: all you have to do is to receive the indicated number of Skill Points:
Concept Art Pack 1: 10 pts
Concept Art Pack 2: 20 pts
The Mighty Wrench: 40 pts
Flip levels: 70 pts
Clank backpacks: 100 pts
MP mechanic skin: 126 pts