Both the Complete various Arena achievements to rank up and "Round For Round" achievement give The Champion title.

'The Shiny' is also given out by both Using Your Nose (Campaign) and It's The Motherload! (Mining)

@SevenEggs As of Patch 1.1.6 this bug is now fixed.

• The duplicate title in the Round For Round (Gauntlet) has been corrected to The Top Dog
• The duplicate title in It's The Motherlode (Mining) has been corrected to The Dignified

I will go ahead and lock this thread. Thank you for your report.