Aside from the normal T and S type techs that are achieved through intuitive means, there are secret techs that can only be attained by completing certain tasks. The following is a list of all such techs.
Unlockable
How to Unlock
Colette's Holy Judgemnt
Use Judgement and Holy Song 50 times each (learning the skill is random; keep using the required techs until she learns Holy Judgement).
Colette's Ice Hammer
Use Pow Hammer 200 times with ice weapon equipped.
Colette's toss hammer
Use pow hammer at least 200 times. When you use it thereafter, it has a chance of becoming a toss hammer, which can poison enemies.
Genis's Indignant Judgement
Use Indignation 50 times, then use Indignation when Genis is in Over Limit.
Kratos's Grave Blade
Use Fierce Demon Fang 200 times with earth weapon equipped.
Lloyd's Falcon's Crest
Equip the "Eternal Swordsman" title, equip the Material Blade, and when Lloyd is in Critical status, press X, A, and B (requires 100 Tech Points).
Lloyd's Grave Blade
Use Fierce Demon Fang 200 times with earth weapon equipped.
Lloyd's Lightning Thrust
Use Sonic Thrust 200 times with lightning weapon equipped.
Lloyd's Lightning Tiger
Use Tiger Blade 200 times with lightning weapon equipped.
Lloyd's Rising Phoenix
Use Rising Falcon 200 times with fire weapon equipped.
Regal's Super Swallow Dance
Use Swallow Dance 200 times with wind weapon equipped.
Zelos's Grave Blade
Use Fierce Demon Fang 200 times with earth weapon equipped.
When the Unison Gauge is full in battle, you will be able to let loose Unison Atacks that allow all four party members to let loose one tech each. If two characters within the sequence use the right teachs, a secret Unison Attack can occur after the basic Unison Attack is complete. The following is a list of all of the game's secret Unison Attacks and the necessary techs and characters that unlock them.
Note that the timing or placement of the tech inputs are not important. So long as the right techs appear within the Unison Attack sequence, the secret Unison Attack will occur afterwards regardless. Also note that even though every secret Unison Attack has more than one tech combination for unlocking it, this table only lists one tech combination for each of them. Regardless of which techs you use to unlock the secret Unison Attacks, you only get one version of each secret Unison Attack anyway.
As you progress through the game, your characters can earn titles for themselves. After earning a title, you can go to the Status screen to change a character's title, which changes their stats and even their clothes in some cases. The following list shows how to get all of Lloyd's secret titles.
Note that this only shows how to get the secret titles you get through special means and side quests, not the titles you receive automatically throughout the main game.
Unlockable
How to Unlock
Arrgh, Me Hearties (changes Lloyd's costume)
After Luin is fully restored, go to the dock and speak with Aifread. Choose to buy his boat, then speak to him again
Beach Boy (changes Lloyd's costume)
After the Flanoir doctor event, return to Altamira and speak with the woman outside the inn. Find her four children, then agree to go swimming
Berserker
Fight 256 battles in the Hard or Mania difficulty level
Boorish General
Use 10 Shurtcuts during battle
Brave Soul
Do not run away from a single battle before defeating Yuan
Combo Expert
Complete a 60 hit combo
Combo Master
Complete a 100 hit combo
Combo Newbie
Complete a 10 hit combo
Comboist
Complete a 30 hit combo
Eternal Apprentice
Use the Wooden Sword until defeating Kilia
Gourmet King
After Lloyd masters all 24 recipes, talk to the Wonder Chef in the Altamira Cafeteria with Lloyd as the on-screen character
Grand Swordsman
Reach level 20
Gung Ho
Defeat Rodyle with a party whose combined level is 145 or less
Holy Sword
Reach level 100
Lone General
Have Lloyd fight a battle alone with a party consisting of at least two people
Master Swordsman
Reach level 40
Midlife Crisis
Correctly identify 100 men in the Uncle Game in Triet
Nobleman
Get during sub-event "Dance Party"
Peeping Tom
Late in the game, go to the Hot Spring. After the initial event, go back and have the females enter the spring
Sword of Swords
Complete Advanced Single mode in the Colisseum with Lloyd
Tactical Leader
Complete Party mode in the Colisseum with Lloyd in the party
Tetra Slash
After executing a basic three hit combo, execute a Level 1, 2, or 3 Tech afterwards
You'll get a title and weapon to each character who you use to beat the Coliseum advanced single mode. You get the weapons only if you've seen the scene behind the Vinheim door.
Complete the game once and save when the game prompts you to do so, restart the game using that same file and the game will tell you to insert Disk 1. Upon doing so, you are taken to a screen where you can purchase various options with GRADE that you may have accumualted over the course of the game. *You will receive 1000 extra GRADE by beating the last boss.
Unlockable
How to Unlock
Carry up to 30 items
Pay 500 GRADE
EXP x 1/2
Pay 10 GRADE
EXP x 10
Pay 3000 GRADE
EXP x 2
Pay 1000 GRADE
Get more bonus EXP from combos
Pay 50 GRADE
Increase Tension
100 Grade
Receive more GRADE after battle
Pay 100 GRADE
Start the game with 500 more HP
Pay 250 GRADE
Start with 160 HP at the beginning of a battle
Pay 10 GRADE
Tranfer over Collecter's Encyclopedia data
Pay 10 GRADE
Tranfer over World Map data
Pay 10 GRADE
Transfer over all spells/techs
Pay 1000 GRADE
Transfer over Battle Strategy data
Pay 10 GRADE
Transfer over Character Collection (Figurines)
Pay 10 GRADE
Transfer over cooking skills (How good the characters are at cooking various meals)
Pay 50 GRADE
Transfer over EX Gems (inventory)
Pay 600 GRADE
Transfer over EX Skills (equipped)
Pay 400 GRADE
Transfer over Gald
Pay 1000 GRADE
Transfer over Memory Gems
Pay 20 GRADE
Transfer over Minigame data
Pay 10 GRADE
Transfer over Monster Encyclopedia data
Pay 10 GRADE
Transfer over play time
Pay 10 GRADE
Transfer over recipes
Pay 50 GRADE
Transfer over Relationships (How much each character likes you)
Pay 10 GRADE
Transfer over the number of times you used certain spells/techs
Tales of Symphonia UNLOCKABLES
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