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.
Ice Girl reaches Level 7
Thunder Girl reaches Level 7
Connect 16 gems once
Ice Girl reaches Level 6
Thunder Girl reaches Level 6
Ice Girl reaches Level 5
Thunder Girl reaches Level 5
40 victories in battle
39 victories in battle
38 victories in battle
37 victories in battle
Have 9 sets of fashion dresses
36 victories in battle
Fire Girl reaches Level 7
35 victories in battle
34 victories in battle
Have 8 sets of fashion dresses
33 victories in battle
Fire Girl reaches Level 6
32 victories in battle
31 victories in battle
30 victories in battle
29 victories in battle
Collect 21 skill books
28 victories in battle
27 victories in battle
Collect 20 skill books
Collect 18 skill books
Collect 19 skill books
Collect 17 skill books
26 victories in battle
25 victories in battle
Ice Girl reaches Level 4
Thunder Girl reaches Level 4
24 victories in battle
23 victories in battle
Connect 14 gems once
Connect 15 gems once
Connect 13 gems once
22 victories in battle
Have 7 sets of fashion dresses
21 victories in battle
Collect 16 skill books
20 victories in battle
Thunder Girl reaches Level 3
19 victories in battle
18 victories in battle6
17 victories in battle
Ice Girl reaches Level 3
16 victories in battle
Have 6 sets of fashion dresses
Fire Girl reaches Level 5
Collect 15 skill books
Have 5 sets of fashion dresses
15 victories in battle
14 victories in battle
Have 4 sets of fashion dresses
13 victories in battle
12 victories in battle
11 victories in battle
Collect 14 skill books
Fire Girl reaches Level 4
10 victories in battle
9 victories in battle
Collect 13 skill books
Collect 12 skill books
8 victories in battle
Ice Girl reaches Level 2
Thunder Girl reaches Level 2
7 victories in battle
6 victories in battle
5 victories in battle
Fire Girl reaches Level 3
Collect 11 skill books
4 victories in battle
3 victories in battle
Destroy 34 gems once
Destroy 36 gems once
Destroy 37 gems once
Destroy 38 gems once
Destroy 39 gems once
Destroy 40 gems once
Connect 10 gems once
Connect 12 gems once
Fire Girl reaches Level 2
Collect 10 skill books
2 victories in battle
Destroy 30 gems once
Destroy 32 gems once
Destroy 25 gems once
Destroy 20 gems once
Connect 8 gems once