By default game have a small issue when playing on 21:9 displays, achievment tracker doesn't fully go away and get stuck on the screen.
To fix this head to the file "Documents\My Games\UnrealEngine3\DevilGame\Config\DevilUI.ini" open it with notepad and add block:

[DevilGame.DVGFxContainer_AchievementNotifier]
m_bApplyOffset=true
m_PosOffset=(X=100,Y=0)

place it after block with this name: [DevilGame.DVGfxContainer_CreditsScreen]. It should look like this:

save file and set it to read only!
If you do everything correct achievements tracker should go away completely:

If you want you can also place hud elements more to the sides of the screen. For now i know only how to move healthbar, overdrive, weapon selector and orb counter.
To move them once again open file: "Documents\My Games\UnrealEngine3\DevilGame\Config\DevilUI.ini",

• find block: "[DevilGame.DVGFxContainer_DanteHealthBar]" and change line "m_PosOffset" to "m_PosOffset=(X=-184,Y=8)"
  
• Same thing with the block: "[DevilGame.DVGFxContainer_OverdriveBar]", change line to "m_PosOffset=(X=-149,Y=110)".
  
• And again with the block: "[DevilGame.DVGFxContainer_WeaponSelector]", change line to "m_PosOffset=(X=-200,Y=535)"
  
• And finally do the same thing with the block: "[DevilGame.DVGFxContainer_RedOrbCounter]", once again change the third line to "m_PosOffset=(X=1200,Y=605)". Save the file and set it to read only.

If you do everything correct HUD will look like this:
This is just for resolution 3440x1440. If you resolution is different you probably gonna need to change every x and y coordinate. Good luck with that :)