Just complete windchill badge. Easiest way by far is Ashebrethafe's way : 5 plasmids, the left most one (slot 3) with max speed, and always keeping it firing using this one. The others will fire at same rate !!! On the top slot, damage plasmid at beginning, and in front, health plasmid. When you've got money, another health plasmid on the bottom front slot, then, a damage plasmid on the bottom rear slot.
When starting a wave, select the slot 3 and wreak everything. Upgrade using the same pattern (slot 3 : speed, slot 4 and 5 : damage, slot 1 and 2 : health), then before the final wave (after wave 10), put all the remaining upgrades on health.
You won ! Impossible to loose, your fire rate is so high that most of enemies can't even came i range for their own weapon. The 2 first waves are a bit hard, and the 10 one also, but nothing really hard.
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