One Turn Kill Achievement Guide: Full Unlock List

One Turn Kill achievement hunting is a process of clearing single-turn card battles across escalating difficulty modifiers and assembling loop combos. Unlocking every Steam badge requires defeating five BIAS 5 bosses, reaching BIAS 20, executing high-volume draw sequences, and fully upgrading every card. This breakdown covers the 2026 Windows release developed by DenDen and published by Waku Waku Games on the official Steam store page.

Even just one slip-up may be fatal, leading to a suspenseful and unique play experience. — the Steam store page

What Are the One Turn Kill Steam Achievements?

The Steam achievement list is a collection of 18 milestone badges covering combat milestones, boss clear thresholds, and deck-cycling interactions in DenDen's strategy card game. Public data recorded on the Steam Community statistics page and PlayTracker's achievement database tracks both public badges and hidden milestones.

Card upgrades require spending upgrade chips earned from stage wins. Unlocking all items awards Card Collector, while finishing every card upgrade step triggers the gadget junkie achievement.

How Do You Defeat Every BIAS 5 Boss?

Boss achievements are progression milestones earned by defeating each encounter at maximum BIAS level 5. Enemy stats and mechanics scale substantially between Lv1 and Lv5, requiring targeted adjustments during deck building.

1. Guard Captain reaches 600 HP at Lv5 and makes all cards in hand fragile after roughly 16 card plays. Deflect this timing window or bypass cost spikes by holding Axium Core.
2. Scythe User Azwen features 650 HP at Lv5 and repeatedly inserts Overload cards into your deck every three plays. Pack high-cost starters such as Assassin's Sign to keep your opening hand full, preventing empty draws that force an immediate turn-end loss.
3. Machine Soldier D-rex enforces a 40-second real-time timer alongside 650 HP at Lv5, raising card costs whenever recovering. Equipping Downclock freezes enemy actions for three card plays, granting time to execute card sequences.
4. Swordsman Bulk reaches 900 HP at Lv5 with complete card seals at battle start, alongside self-healing tied to sealed cards. Deploying Downclock delays early seals, while Reload returns sealed cards to the deck so you redraw them unsealed.
5. Aberration Pastor replaces D-rex if you choose the stairs before the encounter. The boss possesses 600 HP at Lv5 and casts Judgment debuffs: All-Seeing Eye hides UI details, Hand of Salvation randomizes card costs up to 10–13, and Heart of Compassion heals the boss up to 99 HP per played card.

Achieving the Game Complete achievement and the Overload achievement requires configuring every selectable boss to Lv5 so that total BIAS equals 20 before reaching Rita. Defeating Rita's 300 HP phase leads immediately into My Dream at 400 HP, who casts Seal 10 and adds Regret cards that reduce outgoing damage by 6 each.

Which Decks Trigger Orbit and Route 98?

Card-specific achievements are deck-building tasks requiring designated card combinations such as Laevatein or Procyon Device.

To trigger Route 98, combine Homeward Bound with Laevatein in your 20-card deck. Playing Laevatein while under the cost-reducing or return effect of Homeward Bound registers the unlock instantly during the match.

To trigger Orbit, activate five Procyon Devices within a single encounter. Since standard decks permit only three copies of a card, players must generate additional copies during combat. You can add three Procyon Devices to your list, select the skill Double, and utilize backdoor to duplicate the skill action. Copying Procyon Device or Backdoor allows you to play up to seven Procyon activations before concluding the turn.

How Do You Complete the High-Card and Damage Trophies?

Combo achievements are gameplay challenges that demand specific card counts or single-hit damage thresholds during a solo turn. Testing these setups against the practice scarecrow provides an environment free of counterattack timers.

The Lv1 Scarecrow has 999 HP. Defeating this baseline target awards the Whoops! achievement. A Lv2 variant with 99,999 HP and automatic recovery unlocks after clearing the main game, but defeating the 99,999 HP version offers no additional Steam badge.

For Overkill, you must land a single blow dealing 150 damage or higher. Stacking base damage buffs alongside Assassin's Sign+ while deck size remains at five cards or lower easily exceeds this threshold. Heavy Blow builds multiplying high hand counts and cost totals also cross 1,000 damage on single strikes.

Perpetual Motion Machine requires playing over 50 cards in one turn. Players accomplish this by building an infinite loop deck:

1. Add Axium Core+, Homeward Bound+, Tea Ceremony+, and Transcode to your deck.
2. Reduce the casting cost of Axium Core to zero using Tea Ceremony+ or Homeward Bound+.
3. Use Axium Core to repeatedly reshuffle cards from your hand back into your deck, expanding deck volume beyond 50 cards.
4. Draw through the deck using Transcode or All-in while cycling cards continuously until the play counter exceeds 50.
5. An alternative loop combines Iron Coin+ and Flower of Immortality+, generating cards on discard to maintain continuous draw chains.

Which Skills Support High-Difficulty Achievement Runs?

Skill selection is a central mechanic determining whether your deck survives the disruptive abilities of late-game bosses. Defeating enemies at higher BIAS yields skill options, with all skills unlocked once reaching BIAS 15.