Question

the members of the House of Lords who have been given seats through an honored achievement they have accomplished are called

Answer 1

Life Peers.

Becoming aware of the problem of only hereditary Lords in a government, in 1958 the Life Peerages act allowed more people from all walks of life into English government, notably including an increased number in women.

Answer 2

The member of the House of Lords who have been given seats through an honored achievement they have accomplished are called "Honours".

Life Peers are appointed members of the peerage, and their title can't be inherited.

Honours may be created peers in honours lists as rewards for achievement. They're not expected to regularly attend the House of Lords, but they're free to.