TUNIC

Open the chest holding the stick in the first cave, right at the start. Your opening weapon - effectively can't be missed.

Die once and respawn - it happens naturally the first time something kills you and you continue as a spirit.

Reach the Hero's Grave in the East Forest and claim the sword. Mandatory to progress.

Ring the Eastern Bell - clear the eastern path / Guard House and activate the bell tower.

Perform the lunge technique - press attack and dodge-roll together for a rolling lunge attack. It doesn't need to hit anything.

The margin of page 17 hints that throwing enough bombs earns a prize. Throw bombs at enemies (group them near a teleport pad) until it triggers.

Chop down 1000 blades of grass with your weapon, cumulatively. Happens naturally, but can be finished off in dense grass fields.

Make an offering at a fox shrine - while resting, "burn" an upgrade component from the lower-right offering slot.

Ring the Western Bell, reached via the western / docks route.

Toss a coin into the wishing well to make one wish. "Nothing happened" is the joke result.

Engage a black obelisk - a tall pillar with red / green / blue glowing segments. Stand at it and hold interact until it charges and sinks. The first is on the way to the Western Bell.

Freeze yourself - drop an ice (freeze) bomb at your own feet so the freeze catches you. Needs the ice-bomb item.

Get the red key, found in the East Forest after clearing its temple / Siege Engine area. One of the three mandatory keys.

Get the green key, from the mountaintop / West Garden region (the Librarian area).

Get the blue key, deep in the Quarry / Rooted Ziggurat (the Scavenger area).

Collect and deposit all three coloured keys (red, green, blue). Completing the set opens the way to the endgame.

The Cathedral's Prize. After the Heir takes your body and you become a spirit, complete the Cathedral sequence to gain the purple halo / dash - needed to keep progressing.

On the true-ending path, after gaining the halo, visit all six Hero Shrines / Graves and pray (hold) at each to regain your full stats. Not needed for the normal ending.

Free one friendly fairy. There are 20 hidden fairies unlocked by entering Holy Cross D-pad codes at specific spots; freeing any single one pops this.

Secret Treasure #1. Open the locked door near the East Forest entrance and solve the line / route puzzle on the interior wall.

Secret Treasure #3. Outside the Windmill shop - input a Holy Cross directional sequence based on the windmill-sail pattern.

The normal ending. Return and defeat the Heir; you take its place, sealed in the box. This is the ending required for 100% (the separate true ending has no achievement of its own).

Collect all 56 instruction-manual pages. Several late ones need Holy Cross directional puzzles to reach - use a page checklist. The game's largest collectible.

Secret Treasure #6. Lower / East Forest, down the hidden path left of the golden platform - use the magic dagger and wand together, then the magic orb to reach the alcove (hint on page 53).

Secret Treasure #11. Eastern Vault / Hero's Grave ruins - clear the four leaf piles and teleport-dash across the ruins.

Secret Treasure #9. On the Beach - stand on the golden platform and enter the Holy Cross sequence.

Secret Treasure #7. The secret waterfall room - this is the reward for freeing all 20 fairies, so it doubles as the all-fairies payoff.

Secret Treasure #8. Outside the Old House near the wind chimes - solve the directional-input puzzle there.

Secret Treasure #12. The fast-travel hub / Far Shore, at its bottom tip - dash left along a hidden path to the collectible.

Secret Treasure #5. In the Swamp (daytime) near the closed gate - push the four golden skulls into the hole, teleport-dashing across the pillars.

Secret Treasure #4. Near the Ruined Atoll bridge / south beach - a quiet-audio trick: mute the game and stand still in the puddle (about a minute) to trigger the cue, then enter the inputs.

Secret Treasure #10. Ruined Atoll, left of the large central statue - grapple the hooks, cross the wooden bridge, then teleport-dash across the gap to the treasure.

Secret Treasure #2. In the Cathedral area at night - a multi-step puzzle involving altering time and reaching a hidden door. (The name nods to TUNIC's working title, "Secret Legend".)

Make 15 wishes at the wishing well (repeat the coin-toss 15 times across your run).

Have 10 moneybanks (fox piggy-banks) in your inventory at once. The supply is limited and tempting to smash for coins, so don't spend any until you're holding 10.

Genuinely missable. Page 38 references the hidden gun - you must get the gun BEFORE the sword. Route: turn on No Fail, reach the Quarry / Ruined Atoll, grab the Magic Orb, use it to pull the Envoy off the path guarding the gun chest, then grab the gun - all before taking the sword at Hero's Grave. Easiest on a fresh file or New Game+.