Successfully hit every opponent in a race at least once with any Power-Up in Single Player mode.

Complete Act 1 on any difficulty level

Stop the future from becoming a radioactive wasteland

Reach Floor 66

Defeat 100 enemies

Pass an opponent by jumping over/past them in Single Player mode.

Spider-Man is down and out

Restored the third continent

Have attained Combat Level 10

Restored the second continent

Have mastered the Air Boost technique

Gave a souvenir to the Professor