Here is the full list of all 41 The Lost Legends of Redwall™: The Scout Act 2 achievements.
Finish Pontederia
Obtain the amulet
Finish The Pantry
Collect 50% of the jam in Act 2
Finish Silversands
Observe the dam with the wayglass
Send Glimber to his untimely demise
Convince Glimber to go with you without losing any hearts
Finish The Captain
Survive The Captain with all hearts
Finish Old Moss Creek
Collect 25% of the jam in Act 2
Observe the owl with the wayglass
Observe the waterfalls with the wayglass
Finish Prologue
Collect everything and complete all objectives in Prologue
Collect everything and complete all objectives in Old Moss Creek
Collect everything and complete all objectives in The Captain
Collect everything and complete all objectives in Silversands
Collect everything and complete all objectives in The Pantry
Collect everything and complete all objectives in Pontederia
Learn all of the scents in Act 2
Collect all of the documents (Lore, Riddles, and Memoirs) in Act 2
Collect all of the pieces of Gingivere's journal
Convince Tussa to tell you about her toad story
Meet all critters
Complete all sidequests in Act 2
Collect 100% of the jam in Act 2
Upgrade the wayglass to gold by observing all points of interest
Slingshot all destructibles in Prologue
End the boat ride with all three hearts
Slingshot all destructibles in Old Moss Creek
Drown while attempting to recover the jam behind the mill
Slingshot all destructibles in The Captain
Get eaten by Captain Snow
Slingshot all destructibles in Silversands
Slingshot all destructibles in Pantry
Call out Ichabod's exaggeration
Slingshot all destructibles in Pontederia
Complete Pontederia without dying
Jump into the hole during the final chase