No Guts, No Glory
Very rare2.8%ObjectiveOptionalSingle-player
Perform a 2.5 second or longer swan dive
A swan dive lasting 2.5+ seconds, so you need real height. Find a very tall cliff or waterfall over deep water, sprint off and hold the jump so Lara arcs into a swan dive. A big drop in one of the Challenge Tombs or a tall waterfall gives you the air time.