stop at nothing

stop at nothing AND stick at nothing (be willing to do anything in order to achieve something, even if it is dangerous or harms other people) — не останавливаться ни перед чем, идти напролом

Example: She's one of these people who sets herself a goal and then she'll stop at nothing to achieve it. — Она из тех, кто ставит себе цель и ее ничто не может остановить.(CDI)

see also
[the end justifies the means]
[all's fair in love and war]
[no holds barred]
[go to great lengths]
[wouldn't put it past sb]

[for love or money]
[by hook or by crook]
[by fair means or foul ]

[по головам]