these are more powerful variants of the 'local predator' creatures on their respective planets. easily identifiable by the name/health bar that appears at the top of the screen. can be beaten as soon as discovered (I've done so).
1. Oggdo Bogdo (Giant Frog) - Bogano
In the Bogdo Sinkholes area, take the right beam (left goes into Fan Room) and follow the path until you reach a cave filled with slashable poles, it resides in there.
Has same moves as normal version; watch out for double bite, and roll to the side when it flashes red.
2. Albino Wyyyschokk (Giant Spider) - Kashyyyk
In the Imperial Refinery area (outside grassy area), stick to the upper ledge, hug the wall and you'll find a hard-to-see entrance into tunnels, follow the tunnel and you'll eventually enter a cavern filled with spider webs, it resides here.
Has same moves as normal version; don't get caught in webs, roll diagonally when it flashes red.
3. Rabid Jotaz (Giant Ape/Sloth?) - Zeffo
In the Broken Wing area, head to the Crash Site area first, and on the left is a patrolling Jotaz (normal version), above it is a platform and a laser field, disable the laser field go through the gap and follow the path, it will reside past a second gap in a wall.
This one is a pain in the ass to fight normally, so here is an easy way to kill it without dying constantly.
In the fight area for this creature, on the left side, there is a force push-able wall, open it up with force push and get inside. Now turn around and face the creature and do this; attack twice > dodge-roll back (allow monster to attack three times) > roll forwards (towards monster) > repeat.
The monster cannot enter the force push-able room and will stand in front of the entrance just asking to be hit.
4. Nydak Alpha (Giant Wolf/Thing) - Dathomir
In the Nightmare Ruins/Strangled Cliffs area, to the right of the big main door of the temple is a path leading into a wall run, the monster resides here.
Same moveset, not too much trouble, just prepare to dodge a lot, it's normal attack gets 4-5 swings in. Also be aware that to leave it's lair you will have to go through ALOT of enemies, so try not to finish the monster and have half a health bar remaining.
achievement should immediately unlock after the Nydak Alpha, as these creatures should basically be in order of being able to access them (how I did it)