The word "unlockable" means that something can be opened or accessed by completing a certain task or achieving a specific goal. Full definition
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Tony also mentioned the possibility of unlockable characters of which I'm hoping Officer Dick, Ollie the magic bum and Spider - man all make an appearance. (thereticule.com)
If you are a fan of indies, there are a bunch of unlockable characters in the game, including Curly Brace from Cave Story, Commander Video from Bit. (thatvideogameblog.com)
These games are also featured as unlockables in this collection. (videochums.com)