Here is the full list of all 30 The Waste Land achievements.
Finish the game with an act of trust
Finish the game with an act of courage
Defeat the last boss
Find 20 heart power ups
Collect all the upgrades and all the weapons
Find a blade from a distant land
Defeat a sea dwelling boss
Talk, understand, think
A sword with peculiar qualities
Defeat a snow living boss
A blade of incredible powers
Find 15 heart power ups
Find the final arrows set
Find some powerful arrows
There's an hidden crypt full of secrets
Find 10 heart power ups
Strange things may happen..
Defeat a flying boss
Find the explosive arrows
Ancient monuments sometimes have an hidden entrance
Find 5 heart power ups
Find the fire arrows
Find the battle sword
Defeat the first boss
Pierce through enemies with your bow
Find the double jump boots
Follow your fate
Find the short sword
Start a new adventure
Enter the credits level