You can get this achievement on Stage 11 if you play on Hardcore and get 100%. Follow the video exactly and you will get yourself 60G :)
First you must have 80 upgrade points. If you have to, do Stage 11 on normal first to get 20 upgrade points.
Go into the weapon upgrades menu and press Y to reset your upgrade points. Now choose the following upgrades...
Level 1 - Flame - 0 Points
Level 2 - Flame Torrent - 10 Points
Level 3 - Napalm - 10 Points
Level 1 - Raygun - 0 Points
Level 2 - Double Raygun - 10 Points
Level 3 - Plasma - 10 Points
Level 3 - Tesla Disruptor - 10 Points
Level 1 - Mortar - 0 Points
Level 2 - Long Mortar - 10 Points
Level 3 - Homing SSMI - 10 Points
Level 3 - Cluster - 10 Points
Credit for the video
Mggames