i noticed i've only got 1 more day left for my marksman, but i have about 5 screeenshots saved from about 2 weeks ago.
Sat_Aug_8_12-21-56_UTC+0100_2015.png
Sat_Aug_8_12-21-56_UTC+0100_2015.pngSat_Aug_8_12-22-29_UTC+0100_2015.pngSat_Aug_8_12-23-31_UTC+0100_2015.pngSat_Aug_8_12-24-29_UTC+0100_2015.pngSun_Aug_16_20-25-28_UTC+0100_2015.png
now, 1 battle had 0 kills, but had over 2k damage, so not sure if this is good enough, but the other 5 have 2 or more.