Guild Wars 2

What counts for the Plant Slayer Achievement? It’s really starting to bug me that every time i look at my Achievements its stuck at 18 .

When you say plant, I think of Sylvari. In the sylvari areas I think there are plants shooting at you, so you might have killed some when you were there.

See this page on the wiki: http://wiki.guildwars2.com/wiki/Plant
I don’t know if it is complete, so there might be other plants not noted there