-Estimated trophy difficulty: 9/10 (personal opinion)
-Offline: 11 (1, 5, 5)
-Approximate amount of time to core game 100%: 40-50 hours – current estimate
-Minimum number of playthroughs needed: N/A, no story mode
-Missable trophies: None
-Glitched trophies: None
-Cheats: No cheats
Alien Zombie Megadeath is the latest game from developer PomPom Games (Astro Tripper), and is the successor, or perhaps evolution, of the Alien Zombie Death PSP Mini they released in 2010. It's a very simple 2D arcade shooter that's easy to learn, yet challenging and time-consuming if you are trying for 100% trophies. If you like old school arcade gameplay, then this is the game for you.
Step 1: Complete All Adventure Levels
The first thing you'll want to do is complete all 40 adventure levels in the game. Not just unlock, but also complete. These are the blue ones that make the main spiral of the map. You need a total of 100 medals to unlock all adventure levels. On the way you will surely unlock some spacesuits and challenge levels (red ones). Make sure you get the UFO trophy (unlock the UFO upgrade) once you get to level 13 so you can start working on UFO-related medals. This will make unlocking and completing all adventure levels a bit easier.
Step 2: Unlock All Levels
This is done somewhat in tandem with Step 1. There are 71 levels total. You need 180 medals to unlock them all. While doing this, you will more than likely unlock the 30 Million Total Score trophy as well as Wardrobe Complete for unlocking all 9 spacesuits.
Step 3: Get All Medals
If you thought just unlocking all levels was hard, wait until you try to get all of the medals. There are 284 total in the game. All the Medals is a very grueling trophy and may take upwards of 10-20 hours to complete once you have managed to unlock all levels. See that trophy for tips / strategies for all levels and modes.
[PS3T Would Like to Thank Vyrastas for this Roadmap]