libretro cores compatibility list with RetroAchievements

RetroAchievements.md

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+# libretro cores compatibility with RetroAchievements
+
+This is an attempt to make a compatibility list of libretro cores and RetroAchievements. If you want to contribute, please, updated your RetroArch to get the latest (2016/November/05) fixes on the RetroAchievements feature.
+
+- [NES](#nes)
+  - [QuickNES](#quicknes)
+  - [FCEUmm](#fceumm)
+  - [Nestopia](#nestopia)
+- [MegaDrive / Genesis](#megadrivegenesis)
+  - [picodrive](#picodrive)
+  - [Genesis Plus GX](#genesis-plus-gx)
+- [SNES](#snes)
+  - [Snes9x 2010](#snes9x-2010)
+  - [Snes9x 2005](#snes9x-2005)
+  - [Snes9x 2002](#snes9x-2002)
+  - [Snes9x](#snes9x)  
+- [Game Boy / Game Boy Color](#game-boygame-boy-color)
+  - [gambatte](#gambatte)
+  - [mGBA](#mgba)
+- [Game Boy Advance](#game-boy-advance)
+  - [mGBA](#mgba-1)
+  - [VBA Next](#vba-next)
+  - [VBA-M](#vba-m)
+- [PC Engine](#pc-engine)
+  - [Beetle PCE Fast](#beetle-pce-fast)
+
+
+## NES
+
+### QuickNES
+
+The QuickNES seems to be the NES core with the best compatibility. No problems related to RetroAchievements were found in this core after the 05-Nov-2016 fixes.
+
+
+### FCEUmm
+
+There are some know achievements that aren't working with FCEUmm and are working fine with QuickNES. Here is a short list:
+
+**Metroid** (all of them are item pickup cheevos)
+- http://retroachievements.org/Achievement/3515
+- http://retroachievements.org/Achievement/3518
+- http://retroachievements.org/Achievement/3511
+- http://retroachievements.org/Achievement/3507
+- http://retroachievements.org/Achievement/3509
+
+**Super Mario Bros 3**
+- http://retroachievements.org/Achievement/4622
+
+
+### Nestopia
+
+Untested.
+
+
+## MegaDrive/Genesis
+
+### picodrive
+
+No problems at all.
+
+
+### Genesis Plus GX
+
+Untested.
+
+
+## SNES
+
+### Snes9x 2010
+*(previously called SNES9x Next)*
+
+Seems to be working fine, but needs more tests after the 05-Nov-2016 fixes.
+
+
+### Snes9x 2005
+*(previously called CAT SFC)*
+
+Untested.
+
+
+### Snes9x 2002
+*(previously called PocketSNES)*
+
+Untested.
+
+
+### Snes9x
+*(from [this repository](https://github.com/libretro/snes9x))*
+
+Untested.
+
+
+## Game Boy/Game Boy Color
+
+### gambatte
+
+Received a fix on 12-November-2016 and then seems to be working fine.
+
+
+### mGBA
+
+Although mGBA can play Game Boy/Game Boy Color ROMs, it does **NOT** suport cheevos for these systems (only for Game Boy Advance).
+
+
+## Game Boy Advance
+
+### mGBA
+
+Seems to be working fine, but need more tests.
+
+
+### VBA next
+
+Doesn't work OK.
+
+"vba-next doesn't support the memory map interface, so achievements won't work ok with it." - @leiradel
+
+
+### VBA-M
+
+Seems to be working fine, but need more tests.
+
+
+## PC Engine
+
+### Beetle PCE Fast
+*(from [this repository](https://github.com/libretro/beetle-pce-fast-libretro))*
+
+Working fine.