noun
also ar·ri·vist |a(ˌ)rē|vēst, -vist
( -s )
Etymology: French arriviste, from arriver + -iste -ist
: one who employs any means however questionable or unscrupulous to achieve success : an aggressive pushing person : parvenu , upstart
an impoverished family of high breeding and training sneers self-consolingly at vulgar arrivistes — John Hersey