Added TODO list.
Added Achievement packet and updated the rendertile packet handling.
Added Achievement localization.
Moved the selected chesspiece and valid tile positions to NBT.
Enter arena achievement.
Added achievements and moving selected chesspiece to the NBT of the Piece Mover.
Puzzle fail achievements.
Moved chesspiece selection to the Piece Mover's NBT.
Added Achievement handler init.
Added achievements.
Fixing a typo.