Born to a family of actors in Ashgabat, at the age ten he and his family moved to the city of Syzran. For six years Tkachuk was an actor with the Syzran Drama Theatre. In 2002 he joined the Department of Acting at the Russian Theatre Academy (GITIS). After graduation in 2002 he was awarded by the Russian Theatre Union with the Mikhail Tsarev Prize “For successful mastering of actor's profession“. As a fourth-year student he made his debut in Moscow in the Theatre of Nations production of Phaedra. The Golden Ear (Hipolit/Boy) directed by Andrei Zholdak. For this role he received the Moskovsky Komsomolets daily prize in “The Best Debut” nomination. He also appeared in Theatre of Nations productions of N. Sadur's Bullfinches (Leshka Shestakov), directed by T. Sopolev and M. Chumachenko; Swedish Match (Chubikov), directed by N. Grishpun. At the moment he is engaged in A. Nedelkin's production of The Nose after Nikolai Gogol. Tkachuk made his debut in film as Soldier Andrei in Alexander Sokurov's Alexandra. Also appeared in A. Bormatov's Another's Woman; V. Donskov's The Minefield Solo, A. Uchitel's The Edge. In co-authorship with D. Vorobyov he made a short film Prayer that received the Award of the „Artkino” Festival of Short and Low-Budget Films (2010).