Need help with the achievement "viewing 30 clips"

[Mah ♥♥♥♥♥]

I just unlocked all the videos, but now I can't tell which video I watched, so I have spent lots of time watching over old videos and still stuck at 27/30 videos. Any way we can tell if a video has been watched?
If you told me to just go 1 by 1 and eliminate, sure, but sucks for me, I was too stubborn to do it and now I haven't noted down anything. Now I have no idea which video I watched fml...

[Danielsonpl]

Sure, just go into completion list and press the button for completion items ( triangle on dualshock or right mouse button), go to video clips and look for those without a mark next to it.

[Legato Bluesummers]

i didn't even know about that completion items list until my second playthrough, which is a damn shame cuz there's even more ♥♥♥♥♥♥♥♥♥ to complete if you want to tank more hours into it! also, I use it for the heat actions, lots of really fun ones buried there. you'll have to find a guide though cuz it doesn't tell you what you need to do to unlock them.