Here is the full list of all 12 Big Fish Legend achievements.
I've learned kangaroo skills of jumps
Now I can stun my enemies from the distance
For vanquish wild birds
For record-height jumps
Seeing underwater, I can swim faster
I've become a skilled doghunter. Now I can vanquish any dog with one jump
For first vanquishing boss
For vanquishing the Polar Bear
For the conquest of the desert
For banishing The Big Rat
I've become more attentive and can look down now
I'm a real yogi now! I'm not afraid of the quills