Resolution 2880 x 1800 not available in Windows 8 (VMware Fusion 5)
Per VMware's Retina KB article, you can enable 1:1 pixel mapping for a Fusion 5 VM by going to Settings → Display and checking Use full resolution for Retina display.

If after that you don't see the 2880x1800 resolution, you need to make some manual tweaks, following this KB article:


Open the .vmx file in a text editor.
Add the line svga.autodetect = "FALSE"
Add (or update if it already exists) svga.vramSize = 20774912
Add (or update if they already exist) svga.maxWidth = 2880 and svga.maxHeight = 1800
Save the file and open your Windows VM.
In the Windows registry (Start → Run → regedit) search for the vmx_svga key. Per the article, "The correct key has several sub-keys, but it is the main key that should be edited."
Create a new string value (REG_SZ) named Resolution.x, where x is one higher than the highest number listed.
Enter 2880x1800 as the new value.
Restart Windows.
Open the Display Control Panel to change to your new resolution