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