Save the picnic - don't bash the tree to get the starberries for the pie, instead wait for the knight picking fruit just outside the village (head down and to the left) to leave his fruit picker behind and use that to pick the bee hive and remove it.
Wedzel Patch - you get this by shutting the gate to the village every time you leave. You don't physically get given an item, the trophy pops at the end of the game. You can see how you're doing by talking to the blacksmith in the latter parts of the game - ask her how she thinks you're doing.
Finish the potion - you need the feather from the merchant. After Achaka teaches you to shoot in the well, head north past the meat trap and then right (away from the cave with the wolves) to a cliff where you can shoot an arrow. Head across and save the merchant from the goblins - he'll give you the feather and your gold coin back.