Here is the full list of all 28 The Underground Man achievements.
You have finished the training.
You finished the game.
You destoyed the Helicopter Boss without a weapon.
You destroyed the Helicopter Boss.
You reached the city of the San Francisco.
You reached the city of the Vladivostok.
You took Asian as a companion.
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 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 Trap as a companion.
You took Kate as a companion.
You saved your own biography to the clipboard.
You failed a dialogue with an Asian.
You failed a dialogue with Trap.
You failed a dialogue with Kate.
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 have beat the game without loading.