There are 26 shards to find in Albert & Otto. Most of the shards are pretty easy to spot but a few of them are tucked just out of sight. Collectibles are saved when you reach the next checkpoint (after picking up the collectible).
Chapter 1 (4 Shards)
Chapter 2 (6 Shards)
Chapter 3 (2 Shards)
Chapter 4 (5 Shards)
Chapter 5 (2 Shards)
Chapter 6 (5 Shards)
Chapter 7 (2 Shards)