This trophy is for unlocking all skills for use in the game.
Extra Life is not regarded as a skill so don't unnecessarily waste your points on these.
The following skills are available to unlock right from the start of the game.
10 Second Rings
The following skills are available after beating the game.
Time Break (Unlock on purchase from Skill Shop)
Super Sonic (Already unlocked)
The following skills are available to unlock after beating specific challenges using the skill
The following skill are automatically unlocked for collecting all 5 of the Red Star Rings in each act.
Long Spin Dash