- Equip Kulshedra.
- Drop down towards the tentacles.
- Press Y repeatedly to whip with Kulshedra, since this weapon has the longest reach (Not counting guns.) you can kill the tentacles fairly easily. ( They all die in one hit.)
- Make sure you don't miss one, or you won't get the achievement.
- If you do miss a tentacle, make sure you don't land on the platform at the end of the sequence, if you do, you can't go back.
- To avoid the platform, keep out of the green rings going upwards, if you fall, you only take some damage and return the the start of the sequence.