This trophy requires that you complete all Challenges on Bananas difficulty, listed below:

• The Festival
• Snowy Higherlands
• That Other Forest
• Crystal Caverns
• Veiditorp

Note there are two Challenges that you do not need to complete for this trophy (Veteran's Affair and Aldratraz). When doing this as a group, everyone will get credit for these trophies. As mentioned in Stage 4 in the Roadmap, Crystal Caverns and Veiditorp are very easy with use of Staff of Helviti and Death spam.


The Festival

• Waves 1-18: Pretty straight forward. Watch out for Goblin Bombers and Orc Cannoneers, asides from that, nothing is too bad with Death and/or Singularity spam.
• Wave 19: Ice Machine Goblins and Skeletons here (a nasty combo). Use death and fire to kill the goblins as quickly as possible, and then put on Death Shield (     +  + ). Skeletons cannot harm you through Death Shield. If you're quick you can rotate through Cold and Death shields here. A good strategy is to Singularity spammed the goblins, and then did Life AoE for the Skeletons. Note that as Skull Staff and Helviti sucks for healing, Pit Manager and at least one player with a Duck Staff is recommended.
• Wave 20:  Three Archdemons spawn (with some Flamethrowers and Skeletons). If you breezed through this Challenge with Staff of Helviti and Skull Staff, you'll lose to this wave alone. Only three elements can damage the Archdemons, Cold, Earth and Life. Use of Force Prism is recommended with Coldx4 + Life. To use Force Prism, you must have a beam spell in queue, then cast it. The Force Prism will use the beam in the direction it is facing. Next, use Pit Manager as your familiar. When he cycles to buff Cold, this is where you can destroy one of the Archdemons in no time. Use flame shield!!! The only thing that can kill you then is the initial hammer smash, or their close-range melee. Ice Shards did ~10% of their health unbuffed from the Pit Manager (Water + Coldx4); however, you need to charge this to launch. Again, Pit Manager and at least one player with a Duck Staff is recommended.
• General Tips: Fire Shield (     +  + ) is something you need to know right away. This challenge has many Goblin Bombers, Orc Cannoneers, and Goblin Flamethrowers, whom deal pure fire damage (except their melee). Haste is pretty good until the last wave where you'll opt for Force Prism.

Snowy Higherlands

• Waves 1-20: Overall, this one is challenge because you do not have Revive -- you get Guardian/Sacrifice only. If you've relied on Revive a lot in your playthroughs, this will be the biggest adjustment. You can use a double Guardian if needed by using  +  x2 (Life) +  (Lightning) +  +  (Shield) + . A Guardian, if cast when you die will still go through and Revive a player. In the later waves, we'd cast Raise Dead and Guardian at the start of every round. 
• General Tips: Goblin Raid Leaders are annoying! Wave 1 and Wave ~15 have them. A good strategy is to use Singularity on Wave 1 to destroy them almost before they spawn, and Wave ~15, the use of Raise Dead is very helpful to distract them. For this challenge Flame Shield helped with Orc Cannoneers and other fire-based enemies.

That Other Forest

• Waves 1-20: This one is a walk in the park with use of Death Shields and just spamming Death AoE (     + ). Death Shields are recommended because often you will kill each other without them. No wave is overly difficult.