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