Guild Wars 2

What events do i have to get involved in to complete the Ground Pounder Achievement?

Complete the 5 outpost achievements.
Each of these achievements have a list of events. Best way to go is wait in Verdant Brink for a daynight reset, and then do a full chain at every outpost. The central outpost require three tries because there are three seperate events for electing each captain.
click here for details

Pact Camper
Honorary Jaka Itzel
Pale Reaver Believer
Ordance Corp Auxiliary
Patron of the Nobility

Complete those and you have Ground Pounder done

That achievement is to complete each outpost’s achievement, so in short, basically all of the events.

http://dulfy.net/2015/12/06/gw2-verdant-brink-achievement-guide/