Estimated Trophy Difficulty: 2/10
Offline: 11 (6 , 4 , 1 )
Online: 1 (1 )
Approximate Time to 100%: 1-2 hours
Minimum Number of Playthroughs: 1
Missable Trophies: 4 (Untouchable, Wolf Hunter, Three in a Row, Points III)
Does Difficulty Affects Trophies: Yes. You must start a game on each difficulty. You can complete it on easy, though.
Do Cheats Disable Trophies: No cheats, except for save states, which do not disable trophies.
Altered Beast is an arcade classic by Sega made in 1988. You are a Roman centurion who has died in battle, and you are ordered to be resurrected by Zeus to save his daughter Athena from a Demon God called Neff. This game was later ported to the Sega Genesis/Mega Drive, though this is based on the arcade version.
This game is very easy to get 100%. You have unlimited continues, and even when you continue, the score does not reset. All the trophies can be done in one playthrough, though there are a few missable trophies.
Step 1: Start a game on each of the difficulties.
There are four difficulties in this game: Easy, Normal, Hard, and Hardest. Start a game on each difficulty, and once the game starts, exit the game. Once you do this for all four difficulties, you will unlock Renaissance Man.
Step 2: Beat the game. Do not die until you reach level 3.
For an easier time, I suggest that you put the game's difficulty on Easy, set the lives to 4, and Energy to 5. Defeat the first three white wolves in the first stage to get the trophies Giant Man and Three in a Row. For the first two stages, do not die. Abuse the save state feature, since there is no way to replenish health in this game. Upon starting level 3, if you did not die, you will get the Untouchable trophy. Try to defeat as many two-headed wolves as you can, and try not to collect all 3 Spirit Balls early, so that you can keep the stage going for a while to give you more opportunities to kill wolves. Make sure to get the third Spirit Ball before you meet Neff, otherwise you will have to fight the boss while not in beast form, which make the fights very difficult. Try to aim for about 10 wolves per level, which will be enough. Once you have killed 30 wolves, you get the Wolf Hunter trophy. Upon completing the game, you will get the Complete the Game trophy, and all of the score related trophies.
Step 3: Online
Go online and go to Multiplayer and select "Online Co-op". Wait for someone to join, or if you cannot find someone, check the co-op thread for a partner, located here. Upon starting the game, you will earn the trophy Multiple Beasts.
Step 4: Cleanup
You should have all the trophies by now, but you can start a new game and focus on any trophies that you might have missed.
[PS3T Would Like to Thank stgermain for this Roadmap]