Here is the full list of all 88 Gachi Heroes achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Reach level 880
Reach level 870
Reach level 860
Reach level 850
Reach level 840
Reach level 830
Reach level 820
Reach level 810
Reach level 800
Reach level 790
Reach level 780
Reach level 770
Reach level 760
Reach level 750
Reach level 740
Reach level 730
Reach level 720
Reach level 710
Reach level 700
Reach level 690
Reach level 670
Reach level 680
Reach level 650
Reach level 660
Reach level 640
Reach level 630
Reach level 620
Reach level 610
Reach level 600
Reach level 590
Reach level 580
Reach level 570
Reach level 560
Reach level 540
Reach level 550
Reach level 530
Reach level 520
Reach level 510
Reach level 500
Reach level 490
Reach level 480
Reach level 460
Reach level 470
Reach level 440
Reach level 450
Reach level 430
Reach level 420
Reach level 410
Reach level 400
Reach level 390
Reach level 380
Reach level 370
Reach level 350
Reach level 360
Reach level 340
Reach level 330
Reach level 320
Reach level 310
Reach level 300
Reach level 290
Reach level 280
Reach level 260
Reach level 270
Reach level 250
Reach level 240
Reach level 230
Reach level 220
Reach level 210
Reach level 200
Reach level 190
Reach level 180
Reach level 170
Reach level 160
Reach level 150
Reach level 140
Reach level 130
Reach level 120
Reach level 110
Reach level 100
Reach level 90
Reach level 80
Reach level 70
Reach level 60
Reach level 50
Reach level 40
Reach level 30
Reach level 20
Reach level 10