The Opening Act (10)
Race through the first stage.

All Stages Cleared! (50)
Clear Sonic Generations.

Greased Lightning (10)
Clear GREEN HILL Act 1 within one minute.

Bright Star (15)
Get Rank S in an Act.

Shooting Star (20)
Get Rank S in three Acts.

Blazing Meteor (30)
Get Rank S in seven Acts

Blue Comet (40)
Get Rank S in twelve Acts

Big Bang (50)
Get Rank S in all Acts

Trickstar (10)
Pull off a seven or more trick combo or six trick combo ending in a finishing trick.

Eradicator (15)
Defeat 100 enemies.

Ring King (15)
Reach the goal without dropping any of the rings you collected in GREEN HILL Act 1.

Action Hero (10)
Perform all of Sonic's moves in Act 2.

Bonds of Friendship (10)
Complete all Challenge Acts featuring Sonic's friends.

Walkie Talkie (10)
Chat with each of Sonic's friends you have saved.

Join the Ranks (20)
Join the rankings.

A 30-Second Test (20)
Participate in a 30 Second Trial.

Mad Skillz (30)
Get all Skills.

(Hedge)Hogging It All Up! (50)
Get all collectibles.

Time Attacker (30)
Play Ranking Attack on all stages.

Red Ring Collector (30)
Get all Red Star Rings.

Halfway Point (30)
Clear half the Challenge Acts.

Mission Accomplished! (30)
Clear all the Challenge Acts.

Source : ?

la source estd ans le topic de news en parlant de cela c'eétait pas la peine de faire un topic

Conjonctia http://www.xbox360achievements.org/game/sonic-generations/achievements/

Feuque feuque feuque, pas de succès à 100G !
De plus, on est en communauté francophone, donc appelle-ça des succès.
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