What are all the achievements in Sonic Generations?

Answer 1

race through the first stage 10G

clear sonic generations 50G

clear act 1 within 1 minute 10G

Get Rank S in an Act 15G

Get Rank S in 3 acts 20G

get Rank S in 7 acts 30G

get Rank S in 12 acts 40G

get rank S in all acts 50G

pull of 7 or more tricks with

a finishing combo 10G

Defeat 100 enemies 15G

Reach the goal without lossing any

rings in green hill act 1 15G

Perform all of sonic moves act 1 10G

Complete all challenge acts

feachturing sonic friends 10G

Chat with each of sonics friends

you have saved 10G

join the rankings 20G

Participate in a 30 second trial 20G

get all skills 30G

Get all collectibles 50G

play ranking attack on all stages 30G

clear half the callenge acts 30G

clear all the challenge acts 30G

restore the levels 15 G for each

collect all the chaos emeralds 20G

deafeat shadow 25 G

deafeat silver 30G

Deafeat metal sonic 20 G

deafeat perfect 25G

defeate egg dragon 25G

take no damage on the final stage 30G

Got the Red Star Ring on the highest spot 10G

got a red star using a rocket wisp 10G

cleared a regular stage as super sonic 20G

clear sky sanctaury Act 1 without losing a life 20G

wreaked 30 cars on city escape act 2 10G

Got a red star ring in a hidden room on seaside hill act 1 10G

reach the goal in Crisis city act 2 without the tornado hitting you 10G

cleared chemical plant act 2 without entering the water 10G

find a hidden spring in greenhill act 1

got a red ring located on a shorcut route in speed highway act 2

Hoped it helped

I got this Information at Xbox360 achievements.org

don't know who all posted it on there sorry :(