Here is the full list of all 33 Double achievements.
30 headshots
Die of glitch
Die from waiting
Open all letters in dreams
Answer right all questions about dreams
Answer wrong all questions about dreams
Explore all things at the hospital
Skip 10 dialogs
Take 4 pills
Hide pills 5 times
Complete the game without upgrades
Trust Louis
Complete day 1
Complete day 2
Complete day 3
Complete day 4
Complete day 5
Complete day 6
Complete day 7
Complete day 8
Complete day 9
Кill 40 enemies with dash
Kill an enemy with a dash while having a minimum of lucidness
Kill 15 frozen enemies
Kill 15 enemies using focus
Get bad ending
Get good ending
Uncover Lucia's lies
Don't uncover Lucia's lies
Answer right all questions about dreams in day 1
Do not help Louis in the shootout
Kill 15 without aiming
Kill 30 enemies by shooting from cover