Here is the full list of all 98 Boulette Hell achievements.
Win against the third boss with Eburnean
Win against the fourth boss with Eburnean
Win against the fifth boss with Eburnean
Win against the sixth boss with Eburnean
Win against the seventh boss with Eburnean
Win against the eighth boss with Eburnean
Win against the nineth boss with Eburnean
Win against the tenth boss with Eburnean
Win against the eleventh boss with Eburnean
Win against the twelfth boss with Eburnean
Win against the thirteenth boss with Eburnean
Win against the fourteenth boss with Eburnean
Win against the third boss with Azure
Win against the fourth boss with Azure
Win against the fifth boss with Azure
Win against the sixth boss with Azure
Win against the seventh boss with Azure
Win against the eighth boss with Azure
Win against the nineth boss with Azure
Win against the tenth boss with Azure
Win against the eleventh boss with Azure
Win against the twelfth boss with Azure
Win against the thirteenth boss with Azure
Win against the fourteenth boss with Azure
Win against the third boss with Mantis
Win against the fourth boss with Mantis
Win against the fifth boss with Mantis
Win against the sixth boss with Mantis
Win against the seventh boss with Mantis
Win against the eighth boss with Mantis
Win against the nineth boss with Mantis
Win against the tenth boss with Mantis
Win against the eleventh boss with Mantis
Win against the twelfth boss with Mantis
Win against the thirteenth boss with Mantis
Win against the fourteenth boss with Mantis
Win against the third boss with Crimson
Win against the fourth boss with Crimson
Win against the fifth boss with Crimson
Win against the sixth boss with Crimson
Win against the seventh boss with Crimson
Win against the eighth boss with Crimson
Win against the nineth boss with Crimson
Win against the tenth boss with Crimson
Win against the eleventh boss with Crimson
Win against the twelfth boss with Crimson
Win against the thirteenth boss with Crimson
Win against the fourteenth boss with Crimson
Win against the third boss with Gold
Win against the fourth boss with Gold
Win against the fifth boss with Gold
Win against the sixth boss with Gold
Win against the seventh boss with Gold
Win against the eighth boss with Gold
Win against the nineth boss with Gold
Win against the tenth boss with Gold
Win against the eleventh boss with Gold
Win against the twelfth boss with Gold
Win against the thirteenth boss with Gold
Win against the fourteenth boss with Gold
Win against the third boss with Heliotrope
Win against the fourth boss with Heliotrope
Win against the fifth boss with Heliotrope
Win against the sixth boss with Heliotrope
Win against the seventh boss with Heliotrope
Win against the eighth boss with Heliotrope
Win against the nineth boss with Heliotrope
Win against the tenth boss with Heliotrope
Win against the eleventh boss with Heliotrope
Win against the twelfth boss with Heliotrope
Win against the thirteenth boss with Heliotrope
Win against the fourteenth boss with Heliotrope
Win against the third boss with Tawny
Win against the fourth boss with Tawny
Win against the sixth boss with Tawny
Win against the seventh boss with Tawny
Win against the eighth boss with Tawny
Win against the nineth boss with Tawny
Win against the tenth boss with Tawny
Win against the eleventh boss with Tawny
Win against the twelfth boss with Tawny
Win against the thirteenth boss with Tawny
Win against the fourteenth boss with Tawny
Win against the fifth boss with Tawny
Win against the third boss with Bolt
Win against the fourth boss with Bolt
Win against the fifth boss with Bolt
Win against the sixth boss with Bolt
Win against the seventh boss with Bolt
Win against the eighth boss with Bolt
Win against the nineth boss with Bolt
Win against the tenth boss with Bolt
Win against the eleventh boss with Bolt
Win against the twelfth boss with Bolt
Win against the thirteenth boss with Bolt
Win against the fourteenth boss with Bolt
Win against the first boss
Win against the second boss