Heavy mirror ?

What do I need to hang a 15.8 kg mirror into concrete walls
Stephen keenan, October 2016


done
You need mirror adhesive and lots of it

mark cooper glazing of coventry, November 2016
You need a stout frame to begin with - a frame that can support the mirror without falling apart.

In the wall two decent screws that can each withstand a down force of perhaps twice the weight of the mirror and frame.

You would do well to take the mirror to a specialist picture framing shop and ask their advice.

Good Luck..., October 2016