Here is the full list of all 30 Daymare: 1994 Sandcastle achievements.
Start Operation Sandcastle
Obtain the Frost Grip
Survive the first encounter with a Sparker
Find Foster
Escape the Detention Area
Save Gora inside the school
Find the truth about Helen
Reach the Castle
Obtain the Ogre DNA
Reach the Sarcophagus
Defeat Helen Ogre
Finish the game
Finish the game in Hardcore Mode
Finish the game with A Rank
Finish the game with S Rank
Finish the game without dying
Kill 200 Decoys
Kill 10 Sparkers
Freeze 200 enemies
Kill 50 enemies with an headshot
Kill 50 enemies with a Frost Finisher
Hit at least 3 enemies with a single Frost Surge
Hit 50 enemies with the Frost Mine
Destroy 50 lightning orbs with the Frost Grip
Find all documents
Find all scannable objects
Find all audiologs
Find all aliens collectables
Obtain all Frost Grip upgrades
Hack a Very Hard terminal