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Log an unsurpassed achievement (6)

Ross

I believe the answer is:

record

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'log' is the first definition.
(I know that log is a kind of record)

'an unsurpassed achievement' is the second definition.
'record' can be an answer for 'achievement' (record is a kind of achievement). I am unsure of the 'an unsurpassed' bit.

Can you help me to learn more?

(Other definitions for record that I've seen before include "Chronicle or log" , "Tape" , "See 21" , "Written account (none better!)" , "Set down in permanent form" .)

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