Here is the full list of all 49 Sonic Generations Collection achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Joined the rankings.
Participated in a 30 Second Trial.
Got Rank S in all acts.
Cleared Sonic Generations.
Cleared all the missions.
Completed all of Sonic's friends' Challenges.
Chatted with all of Sonic's friends you saved.
Got Rank S in acts 12 times.
Cleared Green Hill within one minute.
Cleared half the missions.
Executed a trick with a seven-step combo or longer.
Performed all of Sonic's actions in Act 2.
Got Rank S in acts seven times.
Found the spring hidden in GREEN HILL Act 1 and reached the goal with a Red Star Ring.
Defeated 100 enemies.
Got Rank S in acts three times.
Got Rank S in an act.
Completed the first stage.
Reached the goal without dropping any of the rings you collected in GREEN HILL Act 1.
Took no damage while defeating the final boss.
Cleared CHEMICAL PLANT without entering the water.
Got all custom skills.
Got all collectibles.
Played Time Attack on all stages.
Got all Red Star Rings.