Here is the full list of all 45 The Mercury Man achievements.
Kill all security guards.
Kill Goldenmouth.
Release Cluck-Cluck.
Release Pastelo.
Release Geldallion.
Release Gobbarbler.
Release Archangelton.
Release Riccar Fire.
Collect all posters.
Bad ending.
Shoot Anne.
Take a train trip without napping.
Clear the table during the train trip.
Leave the bunker with Anne.
Deal with Victoridge.
Betray Andrew.
Finish a fight without using beer, cigarettes and medkits from the inventory.
Execute Cluck-Cluck.
Execute Pastelo.
Arrest Geldallion.
Execute Gobbarbler.
Arrest Archangelton.
Finish gunsmith’s challenge.
Arrest Riccar Fire.
Spend 2 or more hours in the game.
Finish Prologue.
Finish the game without using special ammo.
Use all types of special ammo.
Finish the game without deaths.
Drink 50 bottles of beer (during fights).
Smoke 50 cigarettes (during fights).
Use 20 medkids (during fights).
Execute Riccar Fire.
Execute Archangelton.
Arrest Gobbarbler.
Execute Geldallion.
Arrest Pastelo.
Execute all bosses.
Arrest all bosses.
Release all bosses.
Refuse to shoot Anne.
Shoot Julia.
Leave Mars with a friend.
Leave Mars with the man you love.
Leave Mars with the woman you love.