Is this DLC comming? It says feb 2022?

I'd like to know how long I might expect to play this game from start-to-finish.

I was wondering if anyone who has played the game, could tell me if there are any jumpscares or horror involved?

are there any jump scares, enemies, timers or similar annoyances? and how is saving handled? autosaves/checkpoints or manually anytime?

Any plans to add achievements?