Now I haven’t even attempted this achievement yet because I know that it’s going to be a long arduous fight, but my boyfriend, Millennium King , got the achievement and gave me this great tip.
Not all of the Striders are capable of destroying buildings. The few Striders that can are the ones that are closest to the ground, fast and whose upper bodies are well within reach. In order to get the achievement you need to focus on these little buggers and any Hunters that may be with them first. After they’re gone, you only need to deal with the tall Striders and their Hunters.
For visual help, check this clip out by YouTube user mactiddy: