Here is the full list of all 28 The Underground Man achievements.
You found a copy of the Quantonium Breaker.
You have spoken to the Security Guard of the New New York.
You helped a cop to solve a crossword puzzle.
You gave a lesson to the cellmate.
You failed a dialogue with Pistrun.
You beat all the thugs in the Mitino.
You took Asian as a companion.
You took Kate as a companion.
You failed a dialogue with Trap.
You failed a dialogue with Kate.
You failed a dialogue with an Asian.
You failed the training simulation.
You killed a defenseless cockroach. Be proud of it.
You died first time during the dialogue.
You have launched a steam copy of the game.
You took Trap as a companion.
You reached the city of the San Francisco.
You saved your own biography to the clipboard.
You have finished the training.
You passed through the Shitty thing.
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.