Here is the full list of all 45 Daymare: 1998 achievements.
Take out 50 enemies with headshots
Complete chapter one
Complete chapter two
Complete chapter three
Complete chapter four
Complete chapter five
Finish the game on Daymare Mode
Cast off 50 enemy limbs
Knockback 20 enemies using melee attacks
Utilize 100 fast reloads
Utilize 100 slow reloads
Perform a melee attack on the Melted Man
Free yourself from 20 grabs
Get all ID Tags
Get all documents
Get all audiologs
Find all Hexacore secret rooms
Spot all puppet deer
Get the magnum
Get the desert eagle
Finish the game in 4 hours or less
Finish the game without dying
Craft every type of rapid use fluid
Perform 10 exchanges at an H.I.V.E. terminal
Reach 50% of overdose
Hack into a "very hard" terminal
Shoot at 5 false enemies
Shoot the shaving cream can
Shoot the red balloon
Find the arrow in the tree
Find the branded oak barrel
Find the movie poster
Find playing cards
Find the programmer's corpse
Find the chemical formula mural
Find the sewer pinball
Find the barrelled corpse
Find the flux capacitator
Wait for the suggestion
Find the dead viewer
Find the exploded corpse
Find the science magazine
Find the tris game
Find the researcher's corpse
Find the H.A.F. plate