What speed did you burn it ? Using Imgburn and burn it with speed 4x. I had a problem with other logo stuck such as Dragon's Lair 3D until I go ahead and burnt it with speed 4x and it works fine. The GameCube games are better off with speed 4x to burn and I have are all works great. Try it.
The NTSC version of AC works perfectly fine for me on a PAL Wii, just use WiiGator's MIOS Patcher (use MIOS v8) and Gamecube Backup Launcher, and use patched MIOS (Press B when starting game) to fix the clock. That way, it should work 100%. If it doesn't, it's probably just a bad burn.