In the first phase, the Leviathan will attack with its legs. You must fly during the boss fight and can't attack the Leviathan by standing on the stable shelf. Leviathan's lair is the Food Storage and you can only get there after completing the other main objectives.

The confrontation with the boss takes place in its final part.

Weakening Leviathan is one of the objectives of chapter 6 - Environmental Hazard. Leviathan is a powerful creature and one of the main bosses in Dead Space Remake. The achievement is not as difficult as it might seem - the Plasma Cutter has been the most powerful weapon ever since the original game, if upgraded properly. For this achievement, it does not matter what difficulty you play on, so you can choose any that you are comfortable with. Focus on fully upgrading your Plasma Cutter during this playthrough, as well as your Suit. Here is a little tip: you always find ammo for weapons that were in your inventory, so it's good to keep all new weapons in storage and then you will not come across ammo for weapons that you can’t shoot.

Shoot explosive canisters with your Plasma Cutter.

Use Stasis Module to freeze enemies, throw explosive canisters and all dangerous stuff into the enemies.

Can pick and hold other weapons, but DON`T SHOOT WITH THEM.

Use melee attacks with plasma Cutter (LMB) and Stomp attacks (Space).

Shoot and kill enemies with Plasma Cutter.

You can (does not break the achievement): You still can collect and upgrade the other weapons if you like, as long as you don’t make any shot with them. To unlock this achievement you have to finish a game playthrough with only ever shooting the Plasma Cutter weapon, which is the first weapon you will unlock in Chapter 1 almost at the very start of the game.

Dead space remake achievements