Here is the full list of all 92 Hell Girls achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Thunder Girl reaches Level 7
Fire Girl reaches Level 7
Fire Girl reaches Level 6
Connect 16 gems once
Thunder Girl reaches Level 6
Fire Girl reaches Level 5
Thunder Girl reaches Level 5
Ice Girl reaches Level 7
40 victories in battle
Collect 21 skill books
39 victories in battle
38 victories in battle
37 victories in battle
36 victories in battle
Have 9 sets of fashion dresses
35 victories in battle
34 victories in battle
Connect 15 gems once
33 victories in battle
32 victories in battle
Collect 20 skill books
Collect 19 skill books
31 victories in battle
Have 8 sets of fashion dresses
30 victories in battle
Have 7 sets of fashion dresses
29 victories in battle
Have 6 sets of fashion dresses
28 victories in battle
27 victories in battle
26 victories in battle
Ice Girl reaches Level 6
Have 5 sets of fashion dresses
25 victories in battle
Have 4 sets of fashion dresses
24 victories in battle
23 victories in battle
22 victories in battle
21 victories in battle
20 victories in battle
Ice Girl reaches Level 5
19 victories in battle
Collect 18 skill books
Collect 17 skill books
18 victories in battle6
17 victories in battle
Thunder Girl reaches Level 4
16 victories in battle
Collect 16 skill books
15 victories in battle
14 victories in battle
13 victories in battle
Fire Girl reaches Level 4
12 victories in battle
Collect 15 skill books
Collect 14 skill books
11 victories in battle
10 victories in battle
9 victories in battle
Ice Girl reaches Level 4
8 victories in battle
Collect 13 skill books
7 victories in battle
Fire Girl reaches Level 2
Fire Girl reaches Level 3
Ice Girl reaches Level 2
Ice Girl reaches Level 3
Thunder Girl reaches Level 3
Thunder Girl reaches Level 2
6 victories in battle
Destroy 30 gems once
Destroy 32 gems once
Destroy 34 gems once
Destroy 36 gems once
Destroy 37 gems once
Destroy 38 gems once
Destroy 39 gems once
Destroy 40 gems once
Destroy 25 gems once
Destroy 20 gems once
5 victories in battle
Collect 12 skill books
Collect 11 skill books
4 victories in battle
Collect 10 skill books
3 victories in battle
Connect 13 gems once
Connect 14 gems once
Connect 12 gems once
2 victories in battle
Connect 10 gems once
Connect 8 gems once