Here is the full list of all 44 Niko: Through The Dream achievements.
Find the Teddy Bear in Chapter 17
Find 5 cards in Chapter 15
Find the Teddy Bear in Chapter 15
Find Niko's Secret in Chapter 14
Find the Teddy Bear in Chapter 14
Solve all puzzles in Chapter 11
Complete Chapter 10 in less than 5'20"
Find the Teddy Bear in Chapter 10
Find all the parts of the parchtment scroll in Chapter 09
Complete Chapter 09 without being seen
Collect all Cubes in Chapter 08
Complete the piano sequence in Chapter 07
Complete the first section of chapter 07 without dying
Complete Chapter 04 in less than 4'30"
Complete Chapter 02 in less than 4'30"
Find the Teddy Bear in Chapter 01
Finish Chapter 18
Find the Teddy Bear in Chapter 18
Finish Chapters 16-17
Complete all puzzles in Chapter 16
Find the Teddy Bear in Chapter 16
Finish Chapters 14-15
Finish Chapters 12-13
Find the Teddy Bear in Chapter 13
Find the Teddy Bear in Chapter 12
Finish Chapters 10-11
Find the Teddy Bear in Chapter 11
Finish Chapters 08-09
Find the Teddy Bear in Chapter 09
Find the Teddy Bear in Chapter 08
Finish Chapters 06-07
Find the Teddy Bear in Chapter 07
Fully solve Chapter 06 puzzle
Find the Teddy Bear in Chapter 06
Finish Chapters 04-05
Collect all Diamonds in Chapter 05
Find the Teddy Bear in Chapter 05
Jump into the void from the highest place
Find the Teddy Bear in Chapter 04
Finish Chapters 02-03
Find the Teddy Bear in Chapter 03
Find the Teddy Bear in Chapter 02
Finish Chapter 01
Find all the parts of the parchtment scroll in Chapter 01