Unlock Danger Room Missions:
There is a total of 8 Danger Room missions to unlock. The first three are unlocked during game play but to unlock the other six you have to collect ALL the Sentinel files and Weapon X files for each character.


Achievements
Complete the following tasks to get the corresponding gamerscore.

Unlock Xavier Institute Iceman - Gamersocre 0:
Complete Iceman's training mission

Unlock Xavier Institute Nightcrawler - Gamerscore 0:
Complete Nightcrawler's training mission

Unlock Xavier Institute Wolverine - Gamerscore 0:
Complete Wolverine's training mission

Unlock Danger Room Iceman - Gamerscore 20:
Complete Act 1 of the game

Unlock Danger Room Nightcrawler - Gamerscore 20:
Complete Act 2 of the game

Unlock Danger Room Wolverine - Gamerscore 30:
Complete Act 3 of the game

Unlock X-Men - Gamerscore 50:
Accumulate 950 achievement score

Unlock Champion Iceman - Gamerscore 70:
Collect ALL Sentinel Tech as Iceman

Unlock Champion Nightcrawler - Gamerscore 70:
Collect ALL Sentinel Tech as Nightcrawler

Unlock Secret Identity Iceman - Gamerscore 70:
Collect ALL Weapon X Files as Iceman

Unlock Secret Identity Nightcrawler - Gamerscore 80:
Collect ALL Weapon X Files as Nightcrawler

Unlock Champion Wolverine - Gamerscore 110:
Collect all Sentinel Tech as Wolverine

Unlock Secret Identity Wolverine - Gamerscore 110:
Collect ALL Weapon X Files as Wolverine

Unlock Evolution Wolverine - Gamerscore 120:
Wolverine has been upgraded with ALL available mutations

Unlock Evolution Nightcrawler - Gamersore 125:
Nightcrawler has been upgraded with ALL available mutations

Unlock Evolution Iceman - Gamerscore 125:
Iceman has been upgraded with ALL available mutations