Buy A Taunt And Equip It In > Customize - On The Main Menu.
(I Think They Are Like 1500 In-Game Currency)
- If You're Using A Keyboard Default Hotkey Is [v]
Taunts Are A Great Way To Reduced Eco-Plasm Build-Up.
- Be Aware You Are Making A Trackable Noise Though!
Cumulatively (Between All Your Games) Taunt 250 Times To Pop This Achievement.
Good Luck!