Remove mineturtle achievement if peaceful only

mods/mobs/achievements.lua

@@ -15,13 +15,17 @@ achievements.register_achievement(
       times = 5,
 })
 
-achievements.register_achievement(
+local peaceful_only = minetest.settings:get_bool("only_peaceful_mobs") or false
+
+if not peaceful_only then
+    achievements.register_achievement(
        "bomb_has_been_defused",
        {
           title = S("Bomb has Been Defused!"),
           description = S("Kill a mine turtle."),
           times = 1,
-})
+    })
+end
 
 achievements.register_achievement(
    "ranger",