Here is the full list of all 14 Bounty Hunter: Ocean Diver achievements.
Complete 50 Hard Missions
Complete 40 Hard Missions
Complete 20 Hard Missions
Complete 10 Hard Missions
Complete 50 Medium Missions
Complete 40 Medium Missions
Complete 30 Medium Missions
Complete 20 Medium Missions
Complete 10 Medium Missions
Complete 50 Easy Missions
Complete 40 Easy Missions
Complete 30 Easy Missions
Complete 20 Easy Missions
Complete 10 Easy Missions