Big Spender Trophy
Purchase the Damage upgrade for the Ion Spike.
You first get the Ion Spike during level 4. Once you've obtained it, you need to purchase the damage upgrade in order to get this trophy. Make your way to an Intex Terminal and buy it for 10,000 credits. You have to then leave the Intex Terminal for the trophy to pop. Since it requires you to have 10,000 credits to buy, I've put this trophy as missable since I'm not sure if that would be achievable in level 4 or 5 through Free Play (the levels the Ion Spike appear in).