Here is how:

Step 1:
Begin with ignoring the gameplay of the game.
Yeah this is silly but this is the fastest way to 100% this game
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Step 2:
Reach your objectives:

Objective no1: Get all the "blueprints"

Objective no 1: is achived thru doing:

Objective no 2: Scratchcards: over and over and over again

and objective no 2: is done with Diamonds.
=
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Step 3A;
Either buy enough Diamonds to complete ALL blueprints.

One need around 200.000 diamonds to do this.
= pay about 800Euros to do this with the 25000 x8 Bundles for 99:99Euros a pop.

or
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Step 3B:
Gather about 100 diamonds per approx 10min; thru doing

Objective no 3: The Events that pop up like every 3-4 min where one can get 20-50 diamonds per Event. = approx 100 diamonds per 10 min

= 200.000/10min =atleast 20.000min = 333hours of gametime (watching the game) every 3-4 min)

and then begin focusing on the game it self.

= You get all the INSANE mutliplier bonuses the blueprints gives.

and with having already gotten all the materials needed thru the scratchcards to pass each new stage.

the rest of the game with all the achives can be done in like 10 - 20 hours of gameplay, and most of that will be just POWERLEVLING and then close the game and return back into the game when the "TOWN-countdown" reaches zero and allow one to progress again.

(i would not be surprised if this stage might be done with a gameplay time under 5 hours.)

=

This game have content for about 5 hours (+ every 30sec period it takes to get the diamonds needed).