Find all collectibles in Chapter 2
Find all collectibles in Chapter 8
Complete Chapter 3
Ring the reception bell 10 times
Complete Chapter 9
Find all collectibles in Chapter 5
Find the birthday room.
Find all collectibles in Chapter 4
Complete Chapter 4
Complete Chapter 6
Find all collectibles in Chapter 10
Complete Chapter 8
Complete Chapter 5
Find all collectibles in Chapter 1
Find all collectibles in Chapter 7
Find all collectibles in Chapter 9
Complete Chapter 7
Find all of the pneumatic tube messages
Complete the game
Complete the whole game without dying
Find the second of Ada's notebooks
Complete Chapter 1
Find all collectibles in Chapter 6
Find all collectibles in Chapter 3
Find the first of Ada's notebooks
Complete Chapter 2
Escape the Helios in less than 3 hours
Ring the reception bell
Complete Chapter 10