Here is the full list of all 28 Cathedral 3-D achievements.
Kill your first necromancer.
Witness NPC falling of the edge off the map.
See the red sky for the first time.
Kill your first bishop.
Kill your first angel.
You discovered the deepest secret of Cathedral 3-D and truly defeated The Hand. The invaders have been ultimately repelled for good. You are finally free. Live!
Reach the 7th wave.
Kill 15 enemies with a single bomb
Reach a level 6 combo
Reach a level 7 combo
Reach a level 8 combo
Reach a level 9 combo
Reach a level 10 combo
You died with 0 points, n00b.
Why would you do that?
Score exactly 6,666 points.
Score at least 50,000 points without ever using orbs.
Score at least 50,000 points without getting hit more than once.
Score at least 50,000 points without ever healing.
Score at least 100,000 points.
Kill 1,000 warriors.
Kill 1,000 archers.
Kill 1,000 wizards.
Kill 500 necromancers.
Kill 1,000 zombies.
Kill 200 bishops.
Kill 100 angels.
Kill 10,000 human enemies.