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