This achievement may be seems a bit hard at the beginning and the more you will play the more you will realize that its true. This achievement is very skillfull and at the begin I wasnt really believing that its possible to get it but later on you will upgrade your ship to a really badass warmachine. If you wanna get some high scores obviously you will need to upgrade COLLECT drone to the max. It will fly around you all the time trying to collect as much geoms as he can so you can focus more on the shooting part of the game. I also recommend to upgrade TURRET super to the max because sometimes there is so much going on on the screen and you can barely see your own ship so with this turret you can mop the whole screen. Yes its that powerful at the last upgrade.
One of the hardest things I've occured during play was the final boss because he have a lot of waves coming right at you and you need to stay alive till the very end otherwise the score just wont matter.
Darkened Night and Flonk gave me some advices which I`ve used in redo this solution and here are the set of weapons which I was using towards 3 stars in each level. As you can see collect is most used in Boss levels where you have to avoid his little annoying helpers while the collect super will help you get more geoms. Of course the hardest level for me was level 50 where we have to get through countless waves of enemies and in very hard moment Turret super (maximum upgraded of course) is most useful. Generally if you wanna get all 150 stars in this Adventure mode then first what you have to do is upgrade all super to the max.
Here are the sets of supers which helped me get all stars
1 - Snipe, Homing
2 - Attack, Black Hole
3 - Snipe, Turret
4 - Collect, Turret
5 - Attack, Turret
6 - Attack, Turret
7 - Attack, Turret
8 - Attack, Turret
9 - Attack, Miner
10 - Collect, Turret
11 - Attack, Turret
12 - Collect (this is Pacifism level so you cannot choose any attack super)
13 - Snipe, Turret
14 - Collect, Turret
15 - Snipe, Turret
16 - Snipe, Turret
17 - Collect, Turret
18 - Snipe, Turret
19 - Collect, Turret
20 - Collect, Turret
21 - Ram, Turret
22 - Attack, Homing
23 - Collect, Turret
24 - Collect (again this is Pacifism level)
25 - Collect, Turret
26 - Attack, Homing
27 - Collect, Turret
28 - Attack, Homing
29 - Collect (yep, again it`s Pacifism)
30 - Collect, Turret
31 - Snipe, Turret
32 - Collect, Turret
33 - Attack, Homing
34 - Collect, Turret
35 - Collect, Turret
36 - Attack, Homing
37 - Snipe, Homing
38 - Attack, Homing
39 - Snipe, Homing
40 - Collect, Homing
41 - Attack, Turret
42 - Attack, Homing
43 - Attack, Homing
44 - Collect, Turret
45 - Snipe, Homing
46 - Snipe, Homing
47 - Snipe, Turret
48 - Attack, Homing
49 - Collect, Turret
50 - Collect, Turret
I hope this will help a lot of you guys :)
This game is all about training and the more you will play the more skillfull you will be I am pretty sure of it. If I was able to get all stars in this game anybody can do this :)
Good luck!