Here is the full list of all 80 The Astral Hero achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
U
V
W
X
Y
Z
To protect the forest from invasion
Q
R
S
T
Defend your castle
M
N
O
P
To go to hell
I
J
K
L
Play the map at night
0
6
7
8
9
5
4
3
2
1
E
F
G
H
To walk on the field
Turn off the sound in the game
C
D
First start the game
A
B
YOU JUST WENT INTO THE GAME AND HAVE BECOME COOL