Here is the full list of all 28 The Underground Man achievements.
You failed a dialogue with Kate.
You saved your own biography to the clipboard.
You have finished the training.
You killed a defenseless cockroach. Be proud of it.
You failed the training simulation.
You died first time during the dialogue.
You have launched a steam copy of the game.
You took Kate as a companion.
You took Trap as a companion.
You failed a dialogue with Trap.
You took Asian as a companion.
You failed a dialogue with an Asian.
You beat all the thugs in the Mitino.
You reached the city of the San Francisco.
You failed a dialogue with Pistrun.
You gave a lesson to the cellmate.
You helped a cop to solve a crossword puzzle.
You have spoken to the Security Guard of the New New York.
You passed through the Shitty thing.
You found a copy of the Quantonium Breaker.
You beat Todder by force.
You have passed Todder's medical examination.
You passed through the rooms of Skolkovo.
You reached the city of the Vladivostok.
You destroyed the Helicopter Boss.
You finished the game.
You destoyed the Helicopter Boss without a weapon.
You have beat the game without loading.