- Estimated achievement difficulty: 8/10
- Offline: 23 
- Online: 0
- Approximate amount of time to 1000: 20 – 24 hours
- Minimum number of playthroughs: 4
- Are there any achievements that can be missed: Yes
- Glitched achievements: No
- Do cheat codes disable achievements: No cheats
- Does difficulty affect achievements: No
Step One: Sonic Story
You only pick Sonic until you meet Silver and Shadow during Sonic Story. During each Mission there are 10 silver medals to collect - I suggest getting all the silver medals during your first playthrough of sonic story. There are also silver medals in the town. While playing the story mode, do most of the town missions. After you beat the game, if you need more rings to get the upgrades, keeping playing the last level and beating the final boss until you get enough rings. Next get S-ranks on the normal Levels.
To get S-ranks you must have a perfect run in the level, collect a lot of rings, defeat enemies and complete the level as fast as possible. Once you S-Rank all the normal levels, S-rank the boss stages. To S-rank the boss, you must beat the boss as fast as possible and collect a few rings. Some bosses might take a few tries to S-Rank. Next S-Rank all the town Missions. To S-rank town missions, you must beat the mission as fast as possible. Finally, S-Rank all the Stages on the hard difficulty. There are changes between the normal and hard levels like more enemies, more traps, and different level layouts. The same guidelines to S-rank the normal levels apply to the hard levels.
*I have noticed a weird glitch when I was playing this game as Sonic. Do not used the yellow upgrade (the one the gives you the electric shield) when playing the hard stages, because you can’t do the light dash correctly for some reason. Even if you lose it stills happens, this might save you some frustration from playing this game.
Step two: Shadow Story
First, get all the silver medals during in each mission. Get all the town missions done and collect the silver medals scattered throughout the town. You should have enough rings to purchase all upgrades for shadow before you beat his story. After you beat his story mode, start to S-rank his normal stages. After you S-Rank the normal stages, work on S-rank the boss stages, then the Town Missions and finally the Hard Stages.
Step Three: Silver Story
First, get all the silver medals during in each mission. Get all the town missions done and collect the silver medals scattered throughout the town. You should have enough rings to purchase all upgrades for Shadow before you beat his story. After you beat his story mode, start to S-rank his normal stages. After you S-Rank the normal stages, work on S-ranking the boss stages, then the Town Missions and finally the Hard Stages.
Step Four: The Last Story
The Last Story consists of one level and one boss. There are also ten medals in the one level. You will most likely need to play the level twice - once to get all the silver medals and the second time to S-rank the Level. The Boss is easy once you know how to beat him.
If you miss a silver medal when doing the story, replay the levels until you get the all silver medals. If you miss a silver medal in the town or town mission play the story to find them.
A walkthrough for the story modes can be found HERE.
A silver medal walkthrough for all characters can be found HERE. Print this list out or mark it someway so you know which medal you got in each level.
A town mission walkthrough for all characters can be found HERE.