I know 50 just came out, blah blah blah, but I wanna share my ideas. Please comment what you think and I'm also open to your ideas, too!
Strange Wrangler Counts one thing: Kills your Sentry commits while under its effects)
Strange Buff Banner Counts two things:Kills while under its effects (please add that one in the S.F. version too Valve :3) and Buffs deployed Levels up on kills, but for the Strange Festive variants, it still levels up on Buffs Deployed
Strange Bonk! Atomic Punch Counts two things: Damage dodged and drinks consumed (or as Valve would say, food/lunchbox items eaten) Levels up on damage dodged (and instead of Hale's Own Bonk I want it to be Artful Dodger's Bonk ;))
Strange Crit-a-Cola Counts two things: Kills while under its effects and drinks consumed Levels up on kills
Strange Sandvich Counts two things: Health given or something like that and food items eaten Levels up on health (health could be given to you or other players) The S.F. version still levels up on food items eaten