Here is the full list of all 35 MEGA MAN X DiVE Offline achievements.
Complete Level 175 (Normal)
Complete Level 100 (Normal)
120 characters acquired!
90 weapons acquired!
Complete Level 50 (Normal)
Complete Level 10 (Normal) once
Discover 250 hidden deep element in stages.
Get S-rank in Race Mode
Stage Clear: Deep Log 23-6(Normal)
Stage Clear: Reploid Air Force 22-6(Normal)
Stage Clear: The Host of Fate
Stage Clear: Ammunition Factory 20-6(Normal)
Stage Clear: The Pitiful Host
Stage Clear: Host of Annihilation
Stage Clear: Old Castle 17-6(Normal)
Discover 100 hidden deep element in stages.
Stage Clear: Den Area 16-6(Normal)
Stage Clear: Super-Electromagnetic Lab 15-6(Normal)
Stage Clear: Bio Laboratory 14-6(Normal)
Stage Clear: Snow Base 13-6(Normal)
10 weapons acquired!
Stage Clear: Power Control Center 12-6(Normal)
Stage Clear: Oil Field 11-6(Normal)
Stage Clear: Volcano 10-6(Normal)
Stage Clear: Cyberspace 9-6(normal)
Stage Clear: Military Train 8-6(Normal)
Stage Clear: Area Forest 7-6(Normal)
Stage Clear: Floating Ruins 6-6(Normal)
10 characters acquired!
Stage Clear: Sky 5-6(Normal)
Stage Clear: Air Force 4-6(Normal)
Stage Clear: Factory 3-6(Normal)
Stage Clear: Gallery 2-6(Normal)
Stage Clear: Highway 1-6(Normal)
Discover 1 hidden deep element in stages.