The Update 2.1.0 Title update for Ragnarock has 5 achievements.
Get a bronze medal and nothing more on any song (OST only)
Get a sliver medal and nothing more on any song (OST only)
Get a gold medal on any song (OST only)
Get bronze medals on all the levels of all the songs from Volume 1
Get silver medals on all the levels of all the songs from Volume 1