3. Story walkthrough
Let us play Sonic CD! This page is structured to flow in the order of when you'll unlock these achievements. The videos used in this walkthrough were made by Youtube user Desilent49. Keep in mind that each stage has a robot teleporter and every stage but the last has a metal sonic hologram we need to destroy for an achievement, so don't leave an area until you have everything done.
Here is the video for the first two stages, Palm Tree Panic and Collision Course...
Not far into the first stage you'll find a sign that says "past" (there are multiple signs on this stage) on it. When you pick up a sign you need to keep up your speed to start the time travel sequence. Once you build up enough speed stars will cover your body and you must maintain constant speed. If you slow down too much or stop you will halt the process. If you lose your stars while the sign is blinking (indicating you are about to time travel) you will lose the sign and need to obtain a new one. Once you've picked up a sign, find a spring or ramp to help get speed and try to keep a constant speed for ~5 seconds to time travel and get this achievement.
Whenever you get near the goal of a stage while you are in the present, you will see a sign letting you know that the goal is ahead and Amy will be by it. Stand next to her and she will give Sonic a loving Hug. This is possible in the first stage. You can also receive the hug after the boss in Stardust Speedway if you missed Amy by traveling through time and you never returned to the present. Doing so will get you this achievement.
Now on any stage in Zone 1 or Zone 2 you can obtain a perfect future by destroying the Robot Generator and the Metal Sonic hologram in the past of any stage. Now once you do both in a stage you need to head to the future (not present) and you will see a nicer place to live Badnik free. Finish the stage here to earn this achievement.
Complete a zone in the Good Future
Any zone has 200 rings as long as you time travel. As you collect rings in Zone 1 of Palmtree Panic try to travel to the future or past and revisit areas you just were in the present. It is helpful to try looking for rings in the good future as enemies won't be around to hurt you so you won't lose any rings. Once you hit 200 rings you'll get this achievement.
Zone 2 of Collision Chaos presents a good chance to snag an achievement. Near the end of the stage near the goal post there is actually another post above it. A peel out can help you launch from the half loop near it to reach it. Here is a video to show the way to do this. Credit: AHCommunityVids
You'll earn this achievement...
Pass the upper Signpost in Collision Chaos Zone 2
Here is the video for the third stage, Tidal Tempest
Here is the one for the fourth stage, Quartz Quadrant
Here is the one for the fifth stage, Wacky Workbench
During the the first zone of Wacky Workbench we have another achievement we can achieve. You must enter the past on Wacky Workbench 1 to find a statue hidden inside a wall in the lower drop where a "past" sign was located in the present. Touch the statue and it will reward you. If you are having trouble finding the statue then try to work your way back to the start and pay attention to the lower path as close as you can while the floor is bouncing you up. Focus on trying to land as close to the next spot you would be standing on if the floor was walkable this way you can briefly see if anything is below you.
Find the angel statue in Wacky Workbench
Here is the video for the sixth stage, Stardust Speedway
You'll have a chance at another achievement during Stardust Speedway 3 - If you miss this during the story, you can easily attempt this again in Time Attack. You must beat Metal Sonic to the end in a race without getting hurt. Learn where there spikes are located and run as fast as you can. If Metal Sonic gets close during an attack let him pass you as it is easy to catch up. You'll earn this achievement once you've done it.
Defeat Metal Sonic without getting hurt
Here is the video for the seventh stage, Metallic Madness
If you are following the walkthrough videos, you'll have all of the holograms and generators and...
Destroy all the robot teleporters and Metal Sonic holograms in the past
time stones in the game to net you both achievements.
Collect all the Time Stones
The final boss is about the only real boss fight you get in this game. Whenever Robotnik lands on the ground where Sonic can jump at him is your chance to strike. Avoid the squares coming out of him as those hurt you. These two achievements will both be awarded to you at the end of the game.
Destroy Dr. Eggman's final machine
The last achievement we need is for finishing time attack mode in under 25 minutes. This achievement isn't too bad but could use some practice. Every stage has the clock maxed out and it is up to you to bring the time down. Complete each stage as fast as you can to bring the time under 25 minutes.
These are my personal times
Palmtree Panic: 02'09"51
Collision Chaos: 03'12"68
Tidal Tempest: 03'27"94
Quartz Quadrant: 03'01"91
Wacky Workbench: 03'20"83
Stardust Speedway: 03'16"08
Metalic Madness: 06'11"98
Total : 24'40"93
-For Stardust Speedway 3 don't spend too much time on it as average you will earn 1'20"00. My best run was 1'17"46.
-For Metalic Madness 3 don't stress too hard on beating it in under 2'00"00 as it is a long and annoying level.
Most stages are pretty easy once you understand the layout and had some practice. You'll get this achievement once you have beaten the time target.
Complete the Time Attack mode in under 25 minutes
Once all that is done I must say Congrats on your 200G
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