Here is the full list of all 45 Daymare: 1998 achievements.
Find the barrelled corpse
Find the chemical formula mural
Knockback 20 enemies using melee attacks
Take out 50 enemies with headshots
Free yourself from 20 grabs
Find the programmer's corpse
Complete chapter two
Shoot at 5 false enemies
Get the magnum
Hack into a "very hard" terminal
Perform a melee attack on the Melted Man
Find playing cards
Find the movie poster
Cast off 50 enemy limbs
Find the branded oak barrel
Find the arrow in the tree
Shoot the red balloon
Complete chapter one
Complete chapter three
Complete chapter four
Complete chapter five
Finish the game on Daymare Mode
Utilize 100 fast reloads
Utilize 100 slow reloads
Get all ID Tags
Get all documents
Get all audiologs
Find all Hexacore secret rooms
Spot all puppet deer
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
Shoot the shaving cream can
Find the sewer pinball
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