Here is the full list of all 50 Deadliest Warrior: Battlegrounds achievements worth 1,000 gamerscore.
Unlock All Ninja Items
Unlock All Pirate Items
Unlock All Viking Items
Unlock All Spartan Items
Unlock All Samurai Items
Win 100 Matches in Any Mode
1000 Total Kills in Any Class
Unlock All Knight Items
Rack up 135,000 in Damage
Win 10 Free-For-All Rounds
Win 5 Multi-Team Deathmatch Rounds
Travel 90,000 meters during gameplay
Finish Training Mode
Win 5 Plant the Banner Rounds
100 Kills as a Spartan
100 Kills as a Samurai
100 Kills as a Viking
Rack up 25 Head Explosions
100 Kills as a Ninja
100 Kills as a Knight
Rack up 25 Decapitations
Win 25 Matches in Any Mode
Win 5 Hold the Banner Rounds
Win 5 Last Team Standing Rounds
50 Kills as a Viking
Win 10 Team Deathmatch Rounds
50 Kills as a Knight
50 Kills as a Ninja
Play a match in Every Arena
50 Kills as a Spartan
100 Kills as a Pirate
50 Kills as a Pirate
50 Kills as a Samurai
50 Total Kills in Any Class
Play 10 Matches in Any Mode
Finish Top 3 in a Free For All Match
Play a match using Every Warrior
Host an Online Game
Create a Custom Pirate
Create a Custom Knight
Create a Custom Viking
Create a Custom Spartan
Create a Custom Ninja
Create a Custom Samurai
View the Credits
Become the Top Scorer in Any Mode
View Stats
Earn a Medal in Any Mode
Play 5 Duel Match Rounds
Join an Online Game