Here is the full list of all 20 The Gunstringer: Dead Man Running (Windows) achievements worth 200 gamerscore.
Collect 10 Power-ups in one session
Run 25000 meters in one session
Beat World 3 in Story Mode
Buy a new costume set.
Unlock all Powerups
Complete your first purchase
Complete 25 challenges
Send 25 challenges
Have 10,000 coins at any one time.
Beat World 2 in Story Mode
Beat World 1 in Story Mode
Invite a friend
Complete tutorial and level 1 in Story Mode.
Take down 35 Destructible Targets in one session
Run through 60 turns in one session
Collect 8 Treasure Chests in one session
Collect 2500 Gold Coins in one session
Make your 50th Purchase
Fully upgrade all Powerups
Unlock all Badges in the three worlds of Story.