There's probably only 2 levels where you can easily get this achievement. In The Amazon u have a place with 3 enemies where a monkey spawns very fast so hop on The monkey, hop on The 3 other enemies, And back on The monkey that should've respawned. Also not that you can do it here but need to go from right (monkey) to The left (3 enemies) And hope u go far enough out ofnm The screen that u can go back to The right where The monkey Will respawn. :)
If this doesn't workout very well for you, you can allways Wait until later in The game at The final level, mount vesuvius. There Will be 5 enemies hopping out of The lava. You really need to hit them all 5 in a row or u wont reach The end. So this Will come naturally by that time if you haven't gotten The achievement yet.
Happy Hunting!
NeoSm0ke