Good PC how much FPS?

It is an Acer Aspire XC600 with 6GB Ram DDR3 Nvidia Geforce GT625 which has 2 GB and an Intel Core i5 3350P how much FPS would it achieve on the most famous games like Minecraft Fortnite Csgo etc.

So that's difficult to say at Minecraft. Mine delivers between 34 and 1040 fps depending on the boundary conditions at Minecraft.

Your system is not that great.

Unplayable - I can tell you 100%.

For Minecraft, Fortnite and CSGO, that should still be enough. 60 FPS are loose in there. I wouldn't recommend it to you anyway.

I dare to say that Fortnite is not even playable with it (very little FPS). Csgo you can easily manage over 60 fps and Minecraft can also play around 60fps.

Everything on low settings, of course.

Minecraft FullHD and medium graphics settings: 30-40FPS

Fortnite FullHD and medium graphics settings: 15-20FPS

CS: GO FullHD and medium graphics settings: 15-20FPS