Here is the full list of all 34 Philophobia: The Fear of Love achievements.
Complete The Realm of Denial
Defeat Avowal, Demon of Denial
Complete The Realm of Anger
Defeat Patience, Demon of Anger
Complete The Realm of Bargaining
Defeat Amity, Demon of Bargaining
Complete The Realm of Depression
Defeat Solace, Demon of Depression
Defeat Legion, Lord of Misery
Find your first Lost Soul
Collect 66 Heartifacts
Collect all heartifacts in a realm
Collect all Heartifacts in all realms
Collect All Lost Souls in a Realm
Collect all Lost Souls in all realms
100% the Realm of Denial
100% the Realm of Anger
100% the Realm of Bargaining
100% the Realm of Depression
100% the Realm of Misery
100% all 5 Realms of Grief
Die 66 times in one level
Die by an elevator
In the Realm of Denial, complete 6 levels in a row without dying
In the Realm of Anger, complete 6 levels in a row without dying
In the Realm of Bargaining, complete 6 levels in a row without dying
In the Realm of Depression, complete 6 levels in a row without dying
Rage quit an anger level
While fighting Avowal, shield yourself from love 6 times in a row without dying
While escaping Patience, shield yourself from love at least once and complete the level without dying
While fighting Amity, activate 2 love cannons within 6 seconds
While fighting Solace, welcome the cold embrace of depression exactly 6 times without dying
Kill a Heart Crawler Demon with lovela
Find the secret chamber of six