Remove the ceiling tile and put anchors were needed in the solid structure above the ceiling. Carefully line up the necessary holes needed and attach the connections as needed.

You can also use channel clips that will hold the weight, but you may still need to reinforce the stress by removing the tile, adding additional wire supports, replace the tile and add your clips.

I doubt your suspended ceiling would be strong enough to hold that curtain, especially since the load will always be shifting when you open and close it. You will have to go up to the concrete slab above and drill holes for anchors.