Here is the full list of all 54 The Lost Legends of Redwall: The Scout Act 1 achievements.
Travel over X km on foot
Finish the game
Use the slingshot on every woodlander in the game
Finish Hilltop Camp
Finish Catacombs
Finish Lighthouse Chase
Create a disgusting soup
Finish the scent tutorial without being detected
Finish the stealth tutorial without being detected
Take a dip in the hot springs
Find the picture of Laban and Frabie in Hilltop Camp
Hear Coyle's conversation about your father
Rescue 1 refugee
Rescue all refugees
Break 8 pots in Catacombs
Prevent Swingpaw from burning Thomas's house down.
Light all the braziers in Catacombs
Open all of the shutters in Catacombs
Finish The Pirates without being seen
Visit Jacques Tomb in The Pirates
Hit a rat with a slingshot
Visit Sophia's dad's grave as Sophia in The Pirates
Cause a rat to go aggro
Visit Simon's grave as Liam in The Pirates
Complete Lighthouse Chase without dying
Use the wayglass on the patrolled bridge to locate the lighthouse in The Pirates
Reflect on you wedding vows with your spouse
Use all of the upper paths in Lighthouse Chase in one run
Get Scumsnout to destroy X cabbage crates
Collect the rat tooth in The Weret
User the wayglass to see the owl in The Weret
Finish The Pirates
Get Scumsnout to destroy X boats
Finish the Weret
Get Scumsnout to destroy X crates
Solve the Act 1 Riddle
Get Scumsnout to destroy X planks
Get Scumsnout to destroy X sandbags
Get Scumsnout to destroy X planters
Collect All Lore, Geocaches, recipes, and Mail in The Scouts
Get Scumsnout to destroy X tables
Get Scumsnout to destroy X oars
Collect All Lore, Geocaches, recipes, and Mail in The Pirates
Collect All Lore, Geocaches, recipes, and Mail in The Catacombs
Get Scumsnout to destroy X barrels
Collect All Lore, Geocaches, recipes, and Mail in The Weret
Get Scumsnout to destroy X carts
Collect All Lore, Geocaches, recipes, and Mail in The Lighthouse
Collect All Lore, Geocaches, recipes, and Mail in Act 1
Learn your first scent
Use the rooftop path in The Pirates
Watch the canon epilogue
Use the wayglass to identify the weeping angles
Upgrade the wayglass rim to gold by observing all points of interest (jam excluded)