Here is the full list of all 36 The Flame in the Flood achievements.
Reach High Ground in the Campaign Mode
Build a campfire
Complete the campaign without killing any animals
Survive the first 20 days in Endless Mode without killing any animals
Survive the first 40 days in Endless Mode without eating any plants
Expand your inventory to the maximum
Equip a full set of Bear Hide clothing
Fully upgrade your raft in a single playthrough
Craft every item
Survive 40 days in Endless Mode without sleeping in a shelter
Survive 100 miles in Endless Mode
Survive 200 miles in Endless Mode
Speak with every river resident
Die in every possible way
Kill a wolf
Cure 30 afflictions in a single playthrough
Reach Angel Yards in Campaign Mode
Reach The Kingdom in Campaign Mode
Repair 1000 points of raft health
Killl a Bear
Visit every location type
Start a new game with items in Aesop's bag
After 20 days of travel, have every stat at 100% and no afflictions
Travel 20 miles with the raft motor running
Contract Every Affliction
Travel 10 miles on the river without stopping
Sleep in 20 churches
Have 10 stacked afflictions
Eat all the bad stuff in a single playthrough (tainted bait, spoiled fish, raw meat, spoiled meat, devil's trumpet)
Die from dehydration with suffering from dysentery
Make 50 articles of clothing
Equip a full set of Wolf Hide clothing
Poison 20 wolves with tainted meat
Lure a hostile animal into a snake
Kill every animal type with arrows
Eat every type of plant