Here is the full list of all 25 Majula Frontier: The Offense achievements.
Completed 500 missions
Bought 32 town upgrades
Crafted 500 pieces of gear
Found 30 unlocks
Found 24 unlocks
Win 100 arena battles
Found 18 unlocks
Crafted 100 pieces of gear
Bought 16 town upgrades
Completed 100 missions
Found 12 unlocks
Bought 12 town upgrades
Crafted 75 pieces of gear
Win 35 arena battles
Bought 8 town upgrades
Found 6 unlocks
Crafted 50 pieces of gear
Completed 50 missions
Win 15 arena battles
Bought 4 town upgrades
Completed 10 missions
Crafted 25 pieces of gear
Win 5 arena battles
Win 1 arena battle
Completed 2 missions