The In the Name of the Tsar Add-on for Battlefield 1 has 5 achievements worth 250 gamerscore.
Perform a kill with all "In the Name of the Tsar" weapon variants
Win 5 games of Supply Drop
Kill 25 enemies with the Lance as Cavalry
Play a round on all "In the Name of the Tsar" maps
Play all "In the Name of the Tsar" operations