Does Christ's death mean all our sins can be forgiven?
Yes, because Christ's death on the cross fully paid the penalty of our sin, God graciously imputes Christ's righteousness to us as if it were our own and will remember our sins no more.
What else does Christ's death redeem?
Christ's death is the beginning of the redemption and renewal of every part of creation, as He powerfully direct all things fo His own glory and creation's good