Guild Wars 2

I ‘m going to go out on a limb here and assume to get the Boss Week achievement you have to be one of the maybe 500 people lucky enough to kill Tequatl; and you can’t simply dodge his waves, find some teeth, and dodge his tail to get it.

Yes?

I’m going to go out on a limb here and suggest you look at the living story tab in achievements to check what you need to complete it. Tequatl achievements are a seperate category under ‘bosses’.

Done everything not related to killing the nigh unkillable. Have 8/9.

Boo.

5/9 of the Boss Week achievements can be completed easily. The remaining 4 are done by completing Daily requirements for Boss Week. (Two days ago you just had to complete any World Boss encounter, not just Tequatl.)

The Tequatl achievements are a separate category that (presumably) are permanent additions that can be done at any time.