Do this achievements while playing with the default settings:
Pterodactyl: Defeat a Pterodactyl
Triple Pterodactyl: Defeat three Pterodactyls in one game
Flawless: Finish wave 1 without dying
Wave 10: Get to wave 10
Wave 100: Get to wave 100
Wave 30: Get to wave 30
Wave 5: Get to wave
Camper: Stay in Wave 1 for 120 seconds without dying