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)
Stage Clear: Deep Log 23-6(Normal)
Stage Clear: Reploid Air Force 22-6(Normal)
Discover 250 hidden deep element in stages.
Stage Clear: The Host of Fate
Stage Clear: Ammunition Factory 20-6(Normal)
Stage Clear: The Pitiful Host
Stage Clear: Old Castle 17-6(Normal)
Stage Clear: Host of Annihilation
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)
Stage Clear: Power Control Center 12-6(Normal)
10 weapons acquired!
Stage Clear: Oil Field 11-6(Normal)
Complete Level 10 (Normal) once
Stage Clear: Volcano 10-6(Normal)
Stage Clear: Cyberspace 9-6(normal)
Discover 100 hidden deep element in stages.
Get S-rank in Race Mode
Stage Clear: Military Train 8-6(Normal)
Stage Clear: Area Forest 7-6(Normal)
10 characters acquired!
Stage Clear: Floating Ruins 6-6(Normal)
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.