This achievement can be obtained on the very first level.
Once you enter the chapel look to the right and you will see a fish bouncing on one of the benches, approach it and use
to pick it up, now take the fish forward and place it on the altar using
. Once the fish is on you don't have much time to go and grab the ring, which can be located to the right of the altar, pick it up with
and walk towards the bride and again use
when the ring is near her finger. As long as the fish didn't jump off the altar while doing this the achievements yours.