Full Gameplay Walkthrough...

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A Glitch in the System	See the same collapse happen twice.
A Man of Great Worth	Become Khan.
A Window into the Past	Find a postcard.
An Omen	Meet the shaman.
Bandana	Find Petya.
Down the Rabbit Hole	Have a tea party with friends.
End of the Line	Reach the Terminus station.
Instant Hangover	Use a bottle to knock out an enemy.
Locked and Loaded	Go out on a mission to help your wife.
Lost and Found	Retrieve something that was taken from you.
No Space for a Treehouse	In the home station, find the children's secret hideout.
Not Just Déjà Vu	Bring an object from a hypnotic dream back to the real world.
Now I Have a Machine Gun Ho-Ho-Ho	After getting imprisoned, kill all slavers on the platform before retrieving your gear.
Return to Sender	Retrieve a Helsing bolt from six killed enemies.
Soft Tissue	Hit Nosalises in their weakspots thirty times.
Spartan	Complete the game on hardcore difficulty.
Spring Cleaning	Burn all blocking cobwebs in the labyrinth on your first visit.
Surgical Precision	Kill twenty-five humans with a headshot.
The Scouring of Akademicheskaya	Return home during darker times.
The Way to a Woman's Heart	Eugenia opened up to you.
Threading a Needle	Kill an elite slaver with a single headshot through their visor.
Tili Tili Bom	Follow the singing pipes all the way to the metro tunnel.
Unresolved Business	Free the people locked inside an old train cart.
Upholding the Hippocratic Oath	In a single playthrough, complete all stealth sections without killing any human enemies or getting seen.
Welterweight Champion	Take out five enemies using a melee knockdown.
World Tour	Collect all 33 postcards.