Here is the full list of all 489 NGHTMN achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
EYE
BLADE
PANDA
CAT
ATOM
SKILLET
AXE
HELM
BAT-SWORD
AQUA
SATANA
ANIMAL
ZIPZAP
ARROWS
SWORDS
ANCHOR
ALIEN
CARD
PICE
DWARF
ELF
NAUTILUS
ARROW
GUN
DRAGON
NINJA
ORE
CHILLI
CHICKEN
LVL UP
SKULL
OLYMP
BEAR
STRONG
BAT
BANAN
MONEY
SHILD
ANARHIY
CONTRACT
Eye of Providence
FARAON
EXPAND
KING
RA
H
FIRE
SPIDER
X
Y
Z
U
V
W
R
S
T
Q
P
M
N
O
J
K
L
F
G
I
С
D
E
Е
A
B
C