Figment 2: Creed Valley

After beating the first level and reaching Conviction Lane, progress until you turn off the neighbor's music near the Scrap Garden. Nearby you will find your first Remembrane Shards during an unskippable cutscene. Collecting all the shards in a level will unlock memories and earn progress towards the "Come Full Circle" achievement in the process.

Shards are found on the levels:

• Conviction Lane
• Moral Heights
• Frontal Lobe Plaza
• The Ethics Maze
• Principle Square
• Limbic Uplands
• Amygdala Plateau

Note that shards can be found floating freely in some levels but normally require you to hit a hidden Shard Stone a few times to break them up. Once all shards have been broken free from a Shard Stone, the purple glow on top of the stone will stop.

If you don't know which levels you still need to collect shards on, click PLAY in the main menu and check the shards icon in the top right corner of each level picture. A spiral means you have found at least 50% of the shards and a spiral with a square frame around it means you have found 100% of them and do not need to replay it.

Per Tommy Gun CRG's comment, you do not need to complete the level to count shard collection. Once 100% is achieved you can safely quit to the main menu.

If you would like to follow a video guide for how to 100% Figment 2: Creed Valley in one playthrough, please check out Carrot Helper's video here:

Memory shards or remembrane shards are either already on the map or collected as
drops from memory stones after hitting them. each level percentage goes to obviously 100% meter and memories are given at 50% (Total 7 memories, 6 of them from these shards).

Many of these stones are hidden in plain sight just behind a tree or a house.
Here is my complete guide to everything in Figment 2 with timestamp:

Extended Timestamps:
00:00:00 - Outer Cerebrum
00:15:55 - "Black Hog Down" Achievement
00:16:05 - Conviction Lane
00:17:50 - Listen to Dialogues here
00:20:00 - "Patient Listener" Achievement
00:21:45 - Memory Stone x2 (16.3%)
00:23:00 - Memory Stone (22.9%)
00:25:00 - Memory Stone (32.7%)
00:25:35 - Memory Stone (39.2%)
00:27:00 - Memory Stone (49%)
00:27:35 - Memory shards (54.6%)
00:27:40 - "Remembering Of The Past" Achievement
00:28:05 - Memory Stone (67.3%)
00:28:45 - "Ouch, That hurt!" Achievement
00:29:35 - Memory Stone (73.9%)
00:30:15 - Memory Stone (80.4%)
00:31:15 - Memory Stone (86.9%)
00:32:00 - Memory Stone (100%)
00:35:05 - "Fight Like An Idiot" Achievement
00:35:10 - Moral Heights
00:37:10 - Memory Stone (12.5%)
00:37:55 - Memory Stone (25%)
00:38:45 - Memory Stone (37.5%)
00:39:30 - Memory Stone (50%)
00:39:45 - Memory x2
00:41:15 - Memory Stone (62.5%)
00:42:55 - Memory Stone (81.3%)
00:43:10 - Memory Stone (100%)
00:46:50 - The Moral Compass
00:55:10 - Frontal Lobe Plaza
00:55:25 - Memory Stone (15.8%)
00:57:35 - Memory Stone (31.6%)
00:59:25 - Memory Stone (47.4%)
01:02:00 - Memory Stone (57.9%)
01:02:20 - Memory x3
01:03:00 - Memory Stone (78.9%)
01:03:25 - Memory Stone (89.5%)
01:04:15 - Memory Stone (100%)
01:04:50 - The Ethics Maze
01:08:55 - Memory Stone (9.5%)
01:11:05 - Memory Shards (14.6%)
01:13:15 - Memory Shards (19.6%)
01:15:15 - "Slam-Kabam" Achievement
01:20:05 - Memory Stone (25.9%)
01:22:15 - Memory Stone (32.3%)
01:22:30 - Memory Stone (38.6%)
01:23:45 - Memory Stone (44.9%)
01:25:40 - Memory Shards (55.1%)
01:25:55 - Memory x4
01:30:05 - Memory Shards (65.2%)
01:31:30 - Memory Stone (80.4%)
01:33:20 - Memory Shards (90.5%)
01:37:50 - Memory Stone (100%)
01:38:45 - "You're A-MAZE-ING!" Achievement
01:41:20 - "Repair The Mind Validation Machine" Achievement
01:41:25 - The Moral Compass
01:44:05 - Principle Square
01:44:10 - Memory Stone (14%)
01:46:45 - Memory Stone (28%)
01:49:05 - Memory Stone (37.4%)
01:50:05 - "Whac-A-Worker" Achievement
01:50:50 - Memory Stone (46.7%)
01:51:25 - Memory Stone (56.1%)
01:51:30 - Memory x5
01:51:45 - Memory Stone (65.4%)
01:52:30 - Memory Stone (74.8%)
01:53:05 - "Goaaaaaaaaal" Achievement
01:53:55 - Memory Shards (81.3%)
01:55:00 - Memory Stone (90.7%)
01:55:25 - "A Heavy Thinker" Achievement
01:56:45 - Solving the Crime
01:59:40 - Memory Stone (100%)
02:01:30 - "Elementary, My Dear Dusty" Achievement
02:01:35 - The Moral Compass
02:03:40 - Limbic Uplands
02:03:45 - Memory Stone (9.1%)
02:05:20 - Memory Stone (27.3%)
02:05:50 - Memory Stone (36.4%)
02:07:25 - Memory Stone (45.5%)
02:08:45 - Memory Stone (63.6%)
02:28:55 - Memory x6
02:13:15 - Memory Stone (72.7%)
02:13:50 - Memory Stone (81.8%)
02:14:40 - "Heavy Thoughts" Achievement
02:18:15 - Memory Stone (100%)
02:24:50 - "Flee like An Idiot" Achievement
02:25:00 - Amygdala Plateau
02:26:40 - Memory x7
02:26:45 - "Memory Completionist" Achievement
02:26:55 - "Come Full Circle" Achievement
02:33:30 - The Moral Compass
02:35:35 - The Moral Compass Core
02:47:10 - "Dance Like An Idiot" Achievement
02:47:15 - Ending
02:50:05 - "I'm Back At The Surface Now" Achievement
02:50:15 - Credits
02:54:15 - Post-Credits Scene