Play level 8, "Greystone Plaza". During the final wave, there is a weak spot on the head of the large wyvern. He remains still frequently, allowing for easy critical hits.

Follow the indicated steps to earn the corresponding Steam achievement. To view your achievement progress and stats, open the Steam client, select "Community", then search for the game hub for "Dungeon Defenders 2 (PC)". Click the "View Stats" option in the drop down list, then select the option that displays the achievements for your account.

Bomb Squad : Defeat 100 Kobolds before they light their fuse.

Buster Cannon : Deal 2,500,000 damage with Cannonball Towers.

Clever Girl : Deal 2,500,000 damage with Explosive Traps.

Defender Initiate : Reach level 5 on a hero.

Defense Prodigy : Reach level 25 on a hero.

Dig Dugged : Defeat 50 Witherbeasts before they finish burrowing.

Forgot to Heal : Die.

Shoots Da Fire : Deal 2,500,000 damage with Flameburst Towers.

Special Delivery : Defeat 1,000 special enemies.

Steady Aim : Hit 10 critical hits in a row.

Talon Guard : On four heroes, reach level 25.

The Mythical : Equip a Mythical item in each item slot.

The Zapper : Deal 2,500,000 damage with Lightning Auras.

Triggered My Trap Cart : Activate 100 environmental traps.

Veteran Defender : Reach level 25 on a hero.