Narrow Focus is an achievement in Run 3.
Remember that in some spawning places, it is not possible with the character you selected to try to do this achievement.
As the Duplicator, you can jump off the duplicates to try to span the gap between the tiles. This strategy needs a little luck. Try to spam as fast as possible to minimize the chances of missing a duplicate.
As the Skater, you can quickly jump off the starting box and then jump off the ramp, gaining lots of jump height and speed, and he can finish the level.
As the Child, you can jump on a box, then a ramp, and then glide to the crumbling tiles and gain the achievement.