ACHIEVEMENT - HOW TO UNLOCK The Opening Act (10 points) - Race through the first stage. All Stages Cleared! (50 points) - Clear Sonic Generations. Greased Lightning (10 points) - Clear GREEN HILL Act 1 within one minute. Bright Star (15 points) - Get Rank S in an Act. Shooting Star (20 points) - Get Rank S in three Acts. Blazing Meteor (30 points) - Get Rank S in seven Acts. Blue Comet (40 points) - Get Rank S in twelve Acts. Big Bang (50 points) - Get Rank S in all Acts. Trickstar (10 points) - Pull off a seven or more trick combo or six trick combo ending in a finishing trick. Eradicator (15 points) - Defeat 100 enemies. Ring King (15 points) - Reach the goal without dropping any of the rings you collected in GREEN HILL Act 1. Action Hero (10 points) - Perform all of Sonic's moves in Act 2. Bonds of Friendship (10 points) - Complete all Challenge Acts featuring Sonic's friends. Walkie Talkie (10 points) - Chat with each of Sonic's friends you have saved. Join the Ranks (20 points) - Join the rankings. A 30-Second Test (20 points) - Participate in a 30 Second Trial. Mad Skillz (30 points) - Get all Skills. (Hedge)Hogging It All Up! (50 points) - Get all collectibles. Time Attacker (30 points) - Play Ranking Attack on all stages. Red Ring Collector (30 points) - Get all Red Star Rings. Halfway Point (30 points) - Clear half the Challenge Acts. Mission Accomplished! (30 points) - Clear all the Challenge Acts.