# we must all appear before the judgment seat of Christ

Here "judgment seat of Christ" represents Christ himself, who will judge all people. Alternate translation: "we all must stand in the presence of Christ to be judged" or "Christ will judge all of us"

# appear

"go" or "be present" or "stand"

# each one may receive what is due

"each person may receive what he deserves"

# the things done in the body

"the things he has done in the physical body" 

# whether for good or for bad

"whether those things were good or bad"