now as far as i remember you're only limited to one attack per activation, per troop/unit but does this allow HK assassin droids to move once and attack twice by taking 2 damage?

or can they still only make one attack and just have the ability to move twice or interact?

thanks

As far as I can see, Overdrive only grants an extra action, but says nothing about changing the rules of attacking. So, since HKs don't have any exemption to the one attack rule (the way E-Webs or IG-88 does, for example), they could not attack twice, even with Overdrive.

that's what i figured, thank you for clearing that up