Here’s is a selection of the Portsmouth Round achievement badges.  

They start at 300 and finish with the maximum of 600.

The badges list is

300 400 500 580 600

325 425 525 585

350 450 550 590

375 475 575 595

They will cost you £2.00 each and you will also receive a certificate for the achieved score.

The badges cannot be obtained in retrospect. i.e. if you receive the 450 badge the you cannot send for the 375 badge next time. Although you can start at the lowest badge regardless of your score (obviously obtaining a score of more than 300) and get all the badges in the range.