Ratchet & Clank 3: Up Your Arsenal

This trophy will likely be one of the last you get in the game. To get it, you have to beat the game once and restart in Challenge Mode. Once you do, you can purchase Mega weapons as well as the RY3NO. In order to purchase the Mega weapon variants, you have to upgrade the original weapons to Level 5 first. The Mega variants then become available for purchase at vendors. The RY3NO itself costs 3 million, while the rest of the Mega Weapons vary from 90K to 2 million. Overall, you're looking at a cost of at LEAST 20 million just to purchase the Mega weapons and RY3NO.

Once you have the weapons in question, you'll then have to level them again. The RY3NO has five levels just like most weapons and the Mega Weapons each level up twice more: the first into Ultra Weapons and second into Omega Weapons. Once you upgrade every weapon in the game to max level, you'll unlock this well earned trophy and a floor trophy for the Starship Phoenix.