What the achievement asks
Build all five weapons on the Rocket-Chief Fuselage. Five points, account-wide, both factions.
It is one daily quest, five times, with the choice made for you
All five come from the same place: the Toys For Destruction daily quest. Each time it is available, it offers one of the five weapons, and you do not choose which.
That is the entire achievement and the entire difficulty. Five weapons means at least five days, and because the game picks at random and can repeat, in practice it means considerably more.
The quest is not offered every day either. Toys For Destruction is one of the rotating visitor quests, so a day without it is a day without progress, and there is nothing to do about that.
Expect this to be the last Mechagon achievement you finish
People have reported building the same weapon repeatedly over months while one of the five never came up. There is no way to influence the roll, no vendor and no alternative source.
The only sensible approach is to treat it as background: take the quest whenever it appears, and let it finish itself while you work on everything else the island wants.
If your count looks lower than you remember, that is worth checking rather than dismissing. This achievement has a history of progress being reported as lost after patches, and it is not something you can tell from playing.
What else the daily trip gives you
Because this is gated on the visitor rotation, it lines up exactly with the other Mechagon achievements that need a daily check:
- Outside Influences wants fifteen different visitor quests.
- Junkyard Machinist wants a hundred construction projects, one a day.
- Rest In Pistons has rares gated on the same rotation.
One visit a day covers all four.