South Park Tenormans Revenge

To gain access to new levels, you have to collect Time Cores throughout the game. A total of 69 are needed to unlock all of the 22 levels. Follow the collectables guide to gain more than enough Time Cores.

You can easily get this achievement by getting a gold medal on a boss fight. Beating the boss gains you one time core and the gold medal gains you the other.

On other levels, collecting all three megamen gives you one time core and getting a gold medal gives you another one.

See achievement “Super Adventure Club” for a guide on these.