Here is the full list of all 20 Damascus Gear Operation Osaka HD Edition achievements.
Lived in the Cosmopolis for 1 month.
Completed an emergency mission.
Completed your first mission.
Became a Ranker in the South Ward Saikyo Stadium.
Repaid your debt and survived the final 6 days.
Conquered the Namba Grand Battle.
Won the Divine G-1 Grand Prix.
Defeated the supermassive GEAR, Leviathan.
Became number 1 in the South Ward Saikyo rankings.
Participated in an Exhibition Match.
Reached Electro-Enhancement level 99.
Reached the deepest level of the Cosmopolis.
Became number 1 in the Saikyo overall rankings.
Unlocked the parts of Atsuga with a code canceller.
Pick up a total of 1,000 parts at the mission.
Destroyed 10,000 enemy in total.
Spent a cumulative total of 1,000,000,000,000 Eyn.
Got a cumulative total of 5,000 rare chips.
Cleared all nine types of android matches.
Acquired all the achievements other than this achievement.